Is this Phony Physics? A review of Doug Brignole's Claims and Models and Brig-20 Quad exercises

Описание: ** Responses to Dougs defamation video below**

After appearing on Mark Bell's Power Project, we began to receive some question regarding controversial claims made by Doug Brignole. So we invested in Doug's full product to provide an informed review and opinion.

In this portion of the review, Kassem covers the mathematical problems with Doug's physics models and provides important context abut evaluating exercises on more than just a single point in a resistance curve.

Towards the end there is a chart scoring popular quad exercises like the hack squat, pendulum squat, heel elevated squat, barbell squat, quad dominant leg press, and Doug's Brig-20 quad exercises, the leg extension, cable sissy squat and cable squat.

Everyone probably knows by now that we are fans of the leg extension, especially the Prime Fitness leg extension. But you will have to watch the video to see Kassem's evaluation and ranking of the cable sissy squat and cable squat compared to the other quadricep exercises.

At the end of the day physics is a valuable metric that should be included in the thought process of exercise selection and programming choices. However if you are not doing the physics properly, you may end up making poor decisions.

Quick Response to Doug Brignole's clear defamation intent video:
In response to this video, Doug made a response video where he does admit the models are not accurate. However after that he proceeds to make false claims and use snapshots of this video out of context to try to discredit me personally.

First he says that I do not define the moment arm properly, and that it should be parallel to the resistance. A moment arm is perpendicular to the resistance as I have defined it. Doug is just wrong and/or lying. For reference from Oxford, here is a pasted definition and link.
The shortest perpendicular distance between a force's line of action and an axis of rotation (e.g. a pivot). In a lever, the moment arm of the force is often referred to as the force arm and that of the resistance is referred to as the resistance arm.

https://www.oxfordreference.com/view/...

Doug takes several slides our of context including my remark on where the shin pad sits on the tibia in a leg extension, as I referred to its about 75% the distance on average. This is common and by all means not unreasonable. If it were 85% it would not have changed the point I was making. The length would vary based on the person and machine a few percentage, and the point was it will be less than 100% which skews the model. The squat was being under measured and the leg extension over measured, and when combined, that change in magnitude which is where we have a different opinion on whats acceptably accurate, and how important this single factor will be in the exercise selection paradigm.
.
Doug falsely claims that I didn't properly draw a forearm angle right, and also that that I was trying to say an 18° forearm would have 3x the moment arm as a 10° forearm. First off, Doug references an image of the visual in the mid range position, which has a more vertical position than the bottom. The angle in the illustration is drawn over the bottom position forearm, and then a mid range position was overlayed over the top to demonstrate the elbow traveling forward. Not only is Doug using the image out of context to make a false statement, this would not be comparable in the first place (mid range to bottom position). So it's an irrational argument, based on a lie. The second part of this claim of 18 vs 10 degrees is also false as what I was stating in the video is that because Doug underestimated the moment arm of the 10° forearm position, that the person with different body structure wold have 3x the load magnitude compared to Doug's inaccurate model represents, which is why some people have very different experiences in the tricep effort than what Doug describes. The context here was referring to the argument Mike Israetel presented using anecdotes about the dip. An 18° angle is a little less than double the moment arm of a 10° angle in this case, and Doug underestimated the 10° moment arm by near half, which is why the comparison between an accurately calculated moment arm at 18 is about 3x what Doug's model represents. Doug then proceeds to use some scales to try to visualize his arguments, but he does not properly apply the changes in lever lengths and total mass in the examples, once again using inaccurate models.

Hopefully this video can help you make better decisions in your exercise selection and programming. If you want to learn more about our work, you can check out our member site our courses.

The N1 Membership Site has the most innovative Exercise Library, Articles, Videos, and Workout & Nutrition Programs
www.N1.Training

Shirts & Steel Shakers
www.N1.Training/Merch

Online Courses and Live Practical Events/Seminars
www.N1.education