Exercise for the Human Knee: Part I

48 comments written by Ken Hutchins

Exercise for the Human Knee
Part I

by Ken Hutchins

Note: This material is excerpted from a more-complete chapter in
The Renaissance of Exercise—Volume II by Ken Hutchins.

As with other joints, when we say “exercise for the knee” or “knee exercise” we really mean “exercise for the muscles about the knee.” The knee is a joint, and our volitional control directly affects action of the muscles, not the joints, per se, and for the most part.

Another source of confusion: Knee flexion (knee bending) function is often addressed by a so-called leg curl exercise and knee extension (knee straightening) function is often addressed by a so-called leg extension exercise. To maintain exercise names that reflect joint function is to support precise and consistent nomenclature.

General Descriptions

So with that said, we go on to consider joint function. The knee has four functions: flexion, extension, medial rotation, and lateral rotation. We will primarily focus this discussion on extension.

More superlatives are applied to the knee than any other joint in the body. It is simultaneously the largest joint and one of the most unstable. It possesses 13 ligaments—sometimes known as its static stabilizers. It is driven and also dynamically stabilized by three different muscle groups. And in any position, the involved bones of the knee are never in more than partial contact. The knee possesses the largest synovial membrane of all human joints.

To contrast, the elbow has great stability, because it is mostly statically stabilized by the ligaments and boney delimitations. Most of the knee’s stabilization is dynamic—muscular—not ligamentous or boney.

Note that the elbow—although far more stable than the knee—often incurs a much more serious injury when it is disrupted. In a sense, the knee’s inherent instability actually allows more latitude for functional compromise.

Humanly Unique

The human knee is unique among the primates, most particularly unique among the apes. There remain only four extant apes: gorilla, orangutan, chimpanzee, and human.

One of the oldest and most complete human ancestors yet found was discovered by Donald Johanson and Tom Gray in 1974 in Ethiopia and affectionately named, “Lucy.” Lucy’s most revealing feature was her knee. Not only was her knee nearly complete, but it proved she was, indeed, a true human ancestor by virtue of being able to walk erect.

In making these statements about Lucy’s knee, I am aware of the controversy that surrounds Johanson’s discoveries. Note that such controversies in anthropology are common, and that I find this one particularly frivolous and impertinent:


Nevertheless, the human knee is distinctive among the apes, because it can completely straighten and lock with an attending quasi-relaxed muscular state. The exact mechanism of knee locking is somewhat puzzling and, if interested, I refer you to Mechanism of Locking at the Knee Joint by K. Rajendran:


“Quasi-relaxed muscular state” is my description for a condition whereby the muscles about the knee are mostly relaxed but not completely passive. The resident antagonists are pitted against each other progressively more with relatively greater longitudinal loads along the aligned proximal and distal leg bones. With relatively small loads, these muscles are barely activated. With greater loads, they quiver as they remain protective against hyperextensional forces that might exceed the structural integrity of the cruciates et al. and protective against inadvertent flexion that would collapse the boney support in the opposite direction.

Lucy was immediately recognized as human ancestry (hominid) by Johanson and Gray because other primates—particularly the extant apes—cannot stand erect. Lucy stood and walked erect. Her valgus knee tells us this. Lucy also had a lumbar curve, another indicator of habitual bipedalism.

Chimps do not stand and walk erect. Their knees don’t allow for it. And the architecture of the knees of extinct primates dependably reflect the possibilities—yes or no—for erect walking.

Yes, we witness chimps demonstrating bipedalism. But they don’t like to do it… at least not for long. Since they cannot lock out their knees or extend them as far as we can ours, standing upright on their rears is uncomfortable. So they don’t do it for long and come down on their haunches as soon as convenient.

Gross Human Movement vs. Appendicular Joint Behavior

Most human movement is roughly linear. Reach for an item at the dinner table. The motion of your hand—that device at the end of your upper appendage designed for grasping—moves away from your torso or face and then back to your torso or face in a roughly linear track. This is almost always the case with where we take the ends of our appendages, be they feet or hands.

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But as Arthur Jones noted in an explosion of insight, roughly linear human movement is potentiated by rotational joints. For the most part, joints—particularly appendicular joints—are rotational.

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Arthur’s great epiphany regarding joint rotation was breathtaking! So simple it’s stupid. Where had we all been? This was so obviously true. Why did we not know this? Why did not someone else observe this and point this out as it applied to exercise? Was the medical community sleepwalking? This should have come to us just after fire and the wheel, but we don’t seem to have been that smart!

And yes, Arthur was not the first, but he was the most vocal and expressive about the rotational nature and virtues of the joints. Obviously, men like Zander and Nolan did not entirely ignore this fact.

Yes, these joints do not portray a perfectly circular rotation, because they are ovoid (a la John V. Basmajian).

Yes, these joints have some component of translation. Sliding (translation) simultaneously occurs with the mostly-rotational gross action (a la John V. Basmajian).

And yes, there are joints that behave in an almost purely translational sense, but they do not directly affect this discussion.

But the general plan is rotary form. Hence, Arthur’s first machine was a rotary-form Pullover, and from that basic plan he developed all the other rotary-form machines and, hence, his Ten Requirements of Full-Range Exercise. And as I have explained before, Arthur somewhat got in a rut on this, but that is a tangent better put aside for now.

So there you have it: Joints are rotary. Human motion is linear. But there is another factor of motion—the muscles, those “force-producing engines” as Leonardo aptly described.

Force is always linear. And note that “resistance,” “pressure,” “load,” “weight,” and “tension” are all merely special expressions for “force.”  Therefore, there is no such thing as “rotary resistance” contrary to what Arthur preached. Therefore, muscle contraction and the force it produces are always linear.


As already alluded, there are two basic kinds of motion: translational (linear) and rotational. Through the application of mechanics—primarily the lever—we transpose between linear and rotational formats.

The linear contraction of the muscle is transposed to a rotational format at each joint. Then a triplicate of simultaneous rotations in the limb transposes action at the hand or foot to a linear format. This is what occurs in typical gross bodily movement: standing, sitting, walking, running, crawling, climbing, etc.

In a relationship between an exercise machine and the human body there are always two transpositions in the most elegant state.

Deeply consider the previous sentence. It is profound and consequential. Note the term, “elegant.” It is synonymous with “nonreducible.”

Consider that more than two transpositions are possible, but never less than two.

For example, the vintage Nautilus Duo Squat machine introduces a transpositional pair (cam) beyond the linear format of the foot—between the foot and the weight stack.

Also, consider a leverage machine such as a Hammer Leg Press. It, too, introduces a transpositional pair beyond the linear format of the foot. Note that the final format is linear—gravity—as in all cases that are gravity-dependent.

In 1984, while visiting my engineering friend, Bob Hicks, in Atlanta, I designed—but never built—a leverage leg press that incorporated a sequence of four transpositional pairs beyond the linear format of the foot. I did this to more finely control the resistance applied to the final harmonic lever.

Also, consider an electro-magnetic resistance source. Again, force—as from a magnet—is linear and is transposed to a rotary format in an electric motor. The same thing occurs with the piston and crankshaft in an internal combustion engine.

And, ultrastructurally, there is at least one transpositional pair before the linear format of the muscle. This pair exists at the articulation of the crossbridges!

Linear-Form Transpositions With a linear-form exercise such as a leg press we go from a linear muscle to a rotational joint (transposition #1) and then from the rotational joint to a linear appendage end (hand or foot) (transposition #2) applied to a linear movement arm (no transposition) drawing a linear weight stack or resistance source (no transposition).

Rotary-Form Transpositions With a rotary-form exercise such as a knee extension we go from a linear muscle to a rotational joint with a rotating appendage (transposition #1) applied to a rotational movement arm (no transposition) that is then transposed the second and last time to a linear weight stack (transposition #2).


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Therefore, a leg press exercise serves us well to track the basic action of the feet, which, of course, include articulations at the knees as well as the ankles and hips. In such an exercise, all lower-body musculatures are involved—although some more than others. And with respect to the knees, per se, both the flexors and the extensors are worked.

As Arthur Jones emphasized, such a linear exercise—although very valuable—possesses some mechanical flaws. The same attributes of the knee that enable us to walk and stand almost indefinitely and effortlessly due to what I call “lockout” and what Arthur termed “infinite moment arm” also diminish our ability to keep the quadriceps—among other structures—meaningfully loaded at or near lockout. Since the load becomes in line with the aligned upper and lower leg bones at or near complete extension, meaningful load fades away as we approach the lockout.

As Arthur Jones said, “At lockout, the legs can support weight of the universe. In fact, the legs can lift the universe a very slight distance during the last seconds of a degree of extension. Of course the bones would be crushed.”

Transposition Shift

The single best exercise is a leg press. Without the dangers of a squat (especially a barbell squat), a leg press works the most number of muscles. It works the largest muscles. It is the most physically demanding exercise. It is the most productive exercise. AND… it is the exercise that most subjects would like to avoid. All of these descriptors are connected.

But the most geometrically and mechanically perfect exercise is knee extension. It is that exercise where it is possible to best isolate the target musculature by restraining the torso. It enables the load to be precisely modulated about one joint whereas such mechanical control is impossible to do about a triplicate of joints as in a linear-format exercise such as the leg press.

But the most important advantage of the leg extension is meaningful load potential at full knee extension. Due to its rotational format, there is no lockout and no place of unload. And the rotational format allows for precise and safe loading of the knee—assuming the speed of motion is adequately slow.

This advancement is made possible by what I term transposition shift. Rather than the second transposition of the leg press exercise being in the body, we shift the second transposition to the machine mechanics in a Knee Extension machine employing a rotational format. And this allows us to precisely control that transposition rather than remain at the mercy of the inappropriate load magnitudes—too high or too low—inherent during the body’s linear motion.

Note that Arthur attempted to control the mechanics during the body’s linear format by his creation of the Nautilus Duo Squat machine. This was folly due to the extreme linear loading that converged onto the knees from several simultaneous sources already discussed in other articles.

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Although Arthur never used the transposition terminology that I created, it does explain why he suggested that single-joint, rotary-format exercise machines were theoretically ideal. For a while he even mused that compound movements were no longer necessary. I never went that far—not even close. I say just the opposite for most applications, but both linear and rotary-format exercises have a place.

Once we get this far with an understanding of the required movement format to best exercise the human knee, there are other issues. The correct resistance modulation is then sought, and this is impossible without a strict adherence to a 10/10 speed protocol. This is explained in detail in The Renaissance of Exercise—Volume II due to be published sometime later this year.

In part II, we will briefly explore the fact that a rotary-form exercise machine allows rotary-form joint movement but might or might not impose rotation at the joint. We will also touch on the issues of closed-chain vs. open-chain terminology and the shear force nonsense.

{ 48 comments… read them below or add one }

avatar Donnie Hunt January 29, 2013 at 1:32 pm

As usual there is a great deal of very valuable information here. Looking forward to the next part.


avatar Joshua Trentine January 30, 2013 at 1:06 am

Donnie…thanks! we appreciate the support.


avatar Donnie Hunt January 30, 2013 at 2:33 am

Thank you Sir! I greatly appreciate the great amount you guys and Brenda have shared over the past 2 or 3 years. I go back and read some of the older articles/comments as well. Was looking back over “Dumpers” III earlier and some of that made more sense to me now. I might have to treat myself to TROE vol. I when I get my tax money back.


avatar John Parr January 29, 2013 at 1:37 pm

Another informative, thought provoking article. We need more of this, keep it coming.


avatar Joshua Trentine January 30, 2013 at 1:05 am

thanks John…we have lots more…..I’m starting to feel kind of stingy about giving all this stuff away…..I don’t think its well received or being understood by most anyway.

I may make this stuff available to a small private audience as a pay site…what do you think?


avatar John Parr January 30, 2013 at 7:23 pm

Honestly, I am torn. On the one hand, I definitely feel that we would be better served by getting away from the rest of the HIT community, as I too am disgusted and of the same opinion as you about this society. On the other hand, I like the idea of trading opinions and ideas on a free forum in order to grow the brand by reaching people who may not have found it any other way. The RenEx detractors do serve a purpose.


avatar Mark Love February 3, 2013 at 5:35 pm

People will criticize you no matter what you do. Be clear about what serves your interests and the interests of those who are with you or might be with some persuasion, and let everyone else run their mouths, as they will anyway.

For whatever it’s worth, I’d support whatever choice you made on this.


avatar John Tatore January 29, 2013 at 3:23 pm

Hey Josh

Is that a new different cam I see in the photo on the SuperSlow Systems Leg Extension?



avatar Joshua Trentine January 29, 2013 at 3:30 pm

RenEx cam 🙂

brings the “run away negative” into a whole new light


avatar Donnie Hunt January 30, 2013 at 2:34 am

Looks like a rectangle with rounded sides?


avatar Steven Turner January 29, 2013 at 3:49 pm

Hi Ken,

My understanding is that Arthur Jones could be very difficult to work with. To me what comes out of your article, for those that wanted to learn he got them thinking, to be critical and not just follow the crowd so to speak. It is good that you acknowledge Arthur’s contribution to your own learning – he appeared to challenge you to learn more – what a great education.

Most of the so-called experts say that “leg extension” is a bad exercise for the knees what I say to them it is not that leg extensions exercises are bad it is that most leg extension machines are poorly designed and this is the greatest cause of knee injury.

I’ll have to do a bit of deep thinking about “transpositions” but this will be my learning.


avatar Ed M. January 30, 2013 at 1:12 pm


For many years I labored under the same perception regarding the leg extension. And the confirmation of the error was that I did get hurt. Until the folks at Overload showed me how to do it.

It is now a part of my A routine with very satisfactory results and zero injury. This on clunky equipment at my gym. Correct process can overcome bad design-to a point I think.


avatar Craig January 30, 2013 at 5:08 pm


So any tips on how to do it safer on poor equipment?


avatar Ed M. January 31, 2013 at 12:11 pm


I can tell you what we do.

First we avoid the pathologically hopeless machines. Then we focus on the deepest inroad short of failure.

My wife prefers to avoid dynamic sets and uses TSC and MP on all exercises. I use dynamic on chest press, low row and leg ext. and TSC on the rest. When the point where 1 more rep might bring failure I stop at the max moment arm and hold until the weight slowly brings me back to the start.

The TSC with feedback on the new RenX machines are a terrific training platform for learning how to contract the target muscle, avoid cheating without neccessarily going to failure.

We’ve been at this 3 years with not a day lost to injury.


avatar Joshua Trentine January 29, 2013 at 4:53 pm


“I say to them it is not that leg extensions exercises are bad it is that most leg extension machines are poorly designed and this is the greatest cause of knee injury”

Yes sir and combine poor mechanics with bad behavior and we have a recipe for injury.

The X-Force is likely the worst offender in the field…the good news is that I doubt there will ever be more than two X-Force Leg Extensions in the U.S.


avatar Steven Turner January 30, 2013 at 12:24 am

Hi Josh,

Thanks for the reply


avatar Joshua Trentine January 30, 2013 at 12:59 am

of course…you are welcome 🙂


avatar Joshua Trentine January 30, 2013 at 12:37 am

This isn’t directed at anyone here…just a comment:

I’ve been following the HIT sites for many years, but what I’ve seen as of late from the HIT community has me convinced that the whole culture is completely shot and we would be best served to get as far away as possible.

If this cross-section of the population is indicative of society as a whole….please just shoot me now…

I don’t have words to describe how disgusted I’ve become with these people.


avatar Ed M. January 30, 2013 at 1:31 pm


These forums allow people to confuse notions with truth, opinions with fact and beliefs with erudition. All in a format that produces brief moments of euphoric self-importance. This is clear on Dr McGuff’s site which, along with this, are the only two I regularly visit. Although my time there is growing more limited all the time because of the snark factor.

Personally, I don’t think you are going to get that you want there: a fair fight. And, bluntly, it doesn’t bring out the best in you.

So far as closing the site to all but subscribers, I have mixed feelings. Had BBS been subcription only I might never have found the book or John Little and his writings which led me to Overload. That would have been a great loss for Kristin and me.


avatar Jeff Tomaszewski January 31, 2013 at 9:09 pm

This site would NOT be closed to the public and open to only subscribers. We would still provide tremendous content on the blog BUT we have so much to share that a private site would be the best medium to do this in. This would be a site for those who are serious about learning and progressing. The wealth of information we have is overwhelming sometimes and it’s impossible to relay it all in an open forum. Videos, articles, interviews, behind the scenes at OVERLOAD, etc…I hope this clears things up a bit.


avatar Mark January 30, 2013 at 1:47 pm

Also not directed at anyone here, but as long as you, Josh, have started this thread, I see a crucial difference between RenEx advocates vs detractors: The former have reached conclusions after extensive previous experience with virtually every other protocol, while the latter form their opinions based on avoidance of an actual RenEx workout.


avatar Craig January 31, 2013 at 9:01 am

Aren’t a few of these detractors people who were formerly associated with the SS Guild, and people who had extensive experience with the original SS equipment and protocol? I’m not saying they are right, I just don’t think they can be dismissed as easily as you suggest.


avatar mark January 31, 2013 at 1:11 pm

Ok, I’ll admit to over-generalization, but there’s an overwhelming majority of parties who should be asking questions, but choose to argue instead. The only party I’m sure fits your description is Fred Hahn, who , to my mind, is nit-picking, when in fact he is is much agreement with the foundational principles of SS and ReNex. What I glean from Fred, (perhaps unintended but still real), is that he thinks RenEx is paying too much attention to details of form. I find that absurd: Break form if you choose, but know what perfect form is, thus know if you broke it. Has Fred tried RenEx machines?


avatar Patrick January 30, 2013 at 2:07 pm

It’s become totally anti innovation.

Chasing poundages married to the low carb diet is HIT. Multiple sets, so called muscle confusion, and NTF is all part of the ‘tool box’. Count me out too.


avatar Joshua Trentine January 30, 2013 at 1:01 am

Thinking of making this site private and upping the content… adding more videos and bonuses….we really have a lot of stuff, but i don’t see much sense in giving away the store.



avatar Joshua Trentine January 30, 2013 at 1:33 am

A friend of mine recommended we make it exclusive….A gentleman’s club (I wonder if I can sneak in.lol)

Club RenEx….for members only……i like that idea 🙂


avatar Marie February 26, 2013 at 9:03 pm

Hey, not just a “gentleman’s” club, please! We “ladies” read it too!


avatar Nathan Block January 30, 2013 at 10:18 am

I always thought this site should be a paid site with the amount and quality of information.But Josh how much are we talking about?Monthly or yearly?


avatar Jonas January 30, 2013 at 12:06 pm

Sounds like an excellent idea. If you give away for free too long, the exchange becomes unfair and nattering (negative chatter) starts…as we already seven proof of.



avatar Tom Kalbfleisch January 30, 2013 at 1:27 pm

Yes, make it a pay site. I value the Renex team’s knowledge, and would be willing to pay for unfiltered access to it.


avatar mark January 31, 2013 at 1:21 pm

How about a single-user password that comes with the book? That should cut out most of the unproductive comments.


avatar Pete Collins January 30, 2013 at 4:11 pm

Excellent article
Reading the RenEx articles stretches me in a way I like to dig in and really think about the content and it’s implications to exercising safely. Still soaking up Vol 1, looking forward to Vol 2.
Josh, a private forum seems like a good idea, it would be a gatekeeper for ensuring those who participate really want to learn, share & motivate in a positive manner, fact and evidence based information can be presented. I hope that unlike some other discussions going on out there parasites and agents of self interest and ego will be rejected at the bar door.

Cheers, Pete


avatar Dan Graves January 30, 2013 at 7:37 pm


You might consider it a read-only site. Virtually no one has added to your insight. All they’ve done is waste your time. In school there is a learning progression. How can a teacher/professor teach with mindless questions and irrational debates (from all grades at once). Very very very few have invested the time and intellectual capacity to be at your level. Believe it or not yourself, Ken, Doug, John, Fred are at the cusp of knowledge and walked the same 20+ year path. Keep your personal friends (Joea) and employees as friends and employees, but not equals. Keep your hand on the microphone. Send more videos too!

Fred’s, Doug’s and John’s best success in getting their message out is their books! Ken’s SSEM is another great example. Write your book … make this read only with guest articles.

You are the one of the best!



avatar Nathan Block January 31, 2013 at 10:09 am

very,very good


avatar Brian Schamber January 30, 2013 at 9:45 pm

@ Josh

I will follow this site, pay or otherwise because it offers a point of view that I might have not thought of before. I wouldn’t let others get to you as much as they do, but you are who you are and you feel strongly about your system. What about having an “admission” to those who purchased the book?


avatar Jeff January 31, 2013 at 12:33 am

Hey, sorry this comment has more to do with the actual knee than the exercises. I have often come up with people who advocate running, spinning, etc. as forms of safe and efficient exercise. I continually tell them that those forms of exercise that utilize the knee joint movement excessively will lead to too much wear and tear and give them knee problems later on in life. I know I learned this from you, or at least the HIT community in general. While we’re dealing with the knee I was wondering if you could give out some of the stuff you found in the research that can easily be explained so I can pass it on to them.


avatar enlite January 31, 2013 at 2:37 pm

I understand your sentiments exactly as far as the”HIT”community goes Joshua.Many people still seem to be trapped in this 8-12 exercise per session 2-3 times per week paradigm.I also find it interesting that the paleo/primal diet has been spliced with HIT in certain quarters,and i take serious issue with this supposed healthy way of eating,but i’ll leave that particular issue aside for now.There is no innovation as another poster well pointed out;pre exhaust,drop sets,compound sets,super sets,super duper sets,all kinds of set extenders.There is no such thing as set extending,once the set taken to failure it’s over,that’s it.As much talk as there is about the”HIT community”i don’t think any such thing really exists.I think a better way to describe it would be”HIT communities”.Everyone seems to apply the fundamental principles of HIT however they see fit,which usually means doing more volume and training more frequently.Some people still think that”HIT”is going to revolutionize the exercise industry or something,but i just don’t see that ever happening.That may sound pessimistic or whatever,but i’m basing that on personal experience and observation.As long as the exercise industry remains in the state it is,which Ken Hutchins described as a”CESSPOOL”which it is,it’s not going to improve.


avatar Steven Turner January 31, 2013 at 7:17 pm

Hi josh,

I have made a comment on BBS it is not meant to be critical of the HIT world as I have learnt so much from many people in the HIT world. To me you have always been gracious with your time and giving of information freely. I know that your passionate about RenEX equipment your exercise protocol and you have every right to be. I have found that you have always answered my questions freely and honestly. I think that to some extent if you closed your website than a lot of people who value your knowledge would miss out. Josh you need to give people more credit as I think that many people on this website can determine when someone is attacking you personally. Although I notice that you don’t take a backward step and that you can give as good as you get.

My advice “Continue the great work”.


avatar Matt Spriggs February 2, 2013 at 2:45 pm

Glad I’m not on Jeopardy,

13 ligaments?

Patellar Tendon (Ligament)

What are the other stabalizing ligaments?


avatar Joshua Trentine February 4, 2013 at 12:43 am

There’s the oblique popliteal ligament, there are ligaments of the fibular head that some might include, there’s the transverse genicular ligament, there’s the fibular collateral ligament, there’s the lateral and medial patellar retinaculum.


avatar Joshua Trentine February 4, 2013 at 12:45 am

Text book stuff you should look up…..This comes from an old text. Of course, the “co” laterals are probably two each. And different parts of the capsule are considered “ligamentous.” This gets down to some fine anatomical distinctions that a knee specialist would clarify.


avatar Matt Spriggs February 4, 2013 at 8:20 am


Thank you for the information. The paucity of information relating to the knee is somewhat suprising. I combed over two anatomical texts and googled knee ligaments and found nothing. Only when typing oblique popliteal ligament and the others did I find any information. Like I said, glad I wasn’t on Jeopardy.



avatar Donnie Hunt February 4, 2013 at 9:09 pm


I read what you wrote over on bodybyscience about “complex innate movement synergy patterns”. I know you guys have talked about this on here before and that the Renex machines are designed with this in mind. There are certain conventional exercises where I think I experience what you are talking about. Or a better way to put it is that it feels like I’m trying to prevent my body from working the way it wants to work. Some examples are: Trying to inhibit the foward movement of the upper arms during the top of a standing bicep curl. Trying to inhibit the movement of the clavicles during chest presses pulldowns, and dumbell lateral raises.


avatar Luke O'Rourke February 5, 2013 at 9:05 pm

If your intent is simply to limit/eliminate the peanut gallery then simply having a registration system would get it done, where no one could post under pseudonyms and had to have active e-mail etc. And then a cursory look over what they intend to post before they get to post it would tell you whether their post should be allowed or they should be blocked. If you mean to make money on it, then that’s another thing entirely and more power to you. Eagerly awaiting TROE Part II.


avatar Blain February 12, 2013 at 2:43 pm

Did you catch the latest installment on the dreamlounge website? This guy doesn’t quit does he? I just hope he never runs into you in person. I would love to see his face afterward.


avatar Rose Marie February 12, 2013 at 3:48 pm

Let’s BRIEFLY ‘get to the point’ of ‘simple knee/shoulder exercises’ that will help relieve ‘arthritis type pains, esp. when they occur @ night. Thank you for your helpfulness. (I already go to ‘Exercise Defined/SuperSlow’ 1x ea week, but need more ‘relief esp. @ night’. Thank y’all & may GOD richly bless/guide each of y’all***


avatar Steven Turner February 14, 2013 at 5:20 pm

Hi Josh,

After re-reading the article above again and trying to grasp all the biomechanics attached. A question I am not sure how much detail you want to go into but the current fitness training “functional training” is that exercise machines in particular single joint exercise machines are “not functional”.If my understanding is correct most of human movement is rotary from a linear muscle contraction, hence the reason for rotary type machines.

Most functional type training exercise are a linear/gravity directed applied to human rotary movements. Is this the exact opposite to how the human body functions. Ken mentioned “Arthurs great epiphany regarding joint motion was breath taking! So simple it’s stupid!” Is this something that is still being ignored in the supposed functional training?

I am 57 years of age have access to MedX equipment both single joint and compound machines use RenEX training protocols and my functional movement/ability is better than it has ever been.


avatar Joshua Trentine February 14, 2013 at 6:08 pm

Responding to Steven Turner:

“My understanding is that Arthur Jones could be very difficult to work with.”

I have heard this comment many times over the years. During those years when I worked for Arthur, I quickly responded that he was easy to work with if I kept a positive attitude, answered, “Yes Sir” and “No Sir” and did my best to follow his orders, obey his restrictions, and keep my mouth shut.

Today, I sense that many people are unable to do these simple things.

Yes, I disagreed with Arthur on many fronts, but I agreed with many of his attitudes (and still do) about many issues.

He was my boss. And I admired him greatly. And when I began to disapprove of his direction, he sensed it and my time was over. In a sense, this was appropriate, because it was his company to do with as he pleased.

Simultaneously, I staunchly believe that he forfeited a grand future for Nautilus—growing it way beyond its heyday, because he could not understand the quantum leap in the improvements I offered. I am embarrassed to sound so arrogant, but much time and opportunity has been squandered because Arthur was so obtuse to many finer details.

Fortunately, I am now associated with a team led by Josh Trentine that deeply appreciates the details required in both exercise equipment design and its practical application. And RenEx is unleashing a mountainous volume of information that will draw us together in a common understanding to approach many important problems in a new light.



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