This was the part that made me want to post the video.
I like and am keeping the video.
I appreciate you posting it. It indirectly demonstrate the need for keeping the bar in as close as you can to your body's Center of Gravity.
The "Lift with your Legs" is a good general statement.
However, the issue is that it continues to promote the misconception in a Conventional Deadlift, that you need to "Drive your feet through the floor", essentially "Leg Press" the weight off the floor in all Deadlifts; which is a contraindicaion (based on research) for the majority of Conventional Powerlifting Deadlifters.
With that said, there are some benefits to...
Increasing Torque In A Movement
It allows you to increase the resistance without increasing the load/weight.
Examples
Good Mornings: The movement patter of it is similar to a Deadlift.
Both are Ascending Strength Movements: Hard at the bottom of the movement and easier at the top of the movement.
With the Good Morning, leaning forward increases the Torque.
This allows you to increase the resistance without having to increase the load/weight.
The same applies to the Back Raise/Hip Extension.
Personal Perspective
What I determined, years ago, was that Heavy Good Mornings allowed me to train my Deadlift without beating my lower back up; which Heavy Deadlifts did.
One of item that McLaughlin noted in his Deadlift research is the back is quickly and easily overtrained.
No Clue
When ask why Heavy Good Mornings don't overtrain my lower back, my reply is, "Good question. I have no clue. All I can tell you is that it works."
Ironically, a lot of research on training, medicine, etc often states the same thing. It works but we don't know exactly why. Then many article go into speculation as to why they thing it might; which amount to guessing.
TRX Straps
TRX Strap Resistance Training enables individual to increase or decrease the resistance of an exercise by increasing the Torque.
This article provide an interesting perspective on...
A New Angle on Cable Training
Your teacher always said that ditching math class would come back to bite you on the butt and she was right. Luckily, Nick Tumminello is here to show you how vector mathematics can improve your workouts. (Really.)
www.t-nation.com
Take a look at what happens to the load as the movement progresses, and the ends of the rope are gradually split apart.
As you can clearly see from the above example,
the force increases as the rope is gradually spread apart. At 30 degrees, it took an extra pound of force from each side. So now it takes fifty-two pounds of effort to move that fifty pounds.
At 60 degrees of spread, it took four pounds of additional force from each side. Meaning
it takes fifty-eight pounds of force to move the fifty pounds.
At 90 degrees, fifty pounds now feels like seventy pounds. ...Finally, at 120 degrees of spread...
You're now exerting a hundred pounds of total force; twice as much as what's on the weight stack.
Take Home Message
For individuals interested in working the Triceps at the end of the range of the movement, use a rope that allows you to spread it farther apart
All Hip Extensions Are Not Created Equal
Earlier this year I got a paper published in the SCJ titled, Are All Hip Extension Exercises Created Equal (click to download). I’m very proud of this paper and feel that it’s...
bretcontreras.com
This is example on how to increase Deadlift Strength with Auxiliary Exercises in specific areas.
1) Good Mornings: The loading
Torque is the greatest in the bottom part of the movement. This movement
builds Strength in the bottom position of the Deadlift.
2) 45 Degree Back/Hip Extension: The loading
Torque is the greatest in the middle part of the movement. It increases
Strength in the knee area of the Deadlift.
3) 90 Degree Back/Hip Extension: The loading
Torque is the greatest a the top end of the movement. It in
creases Strength in the in the top part/lockout of the Deadlift.
Summary
Torque isn't necessarily bad.
Torque can be used and an effective training tool, if used correctly.