Actually, David has been making great gains using the Gym Movement protocol with Adam Glass and company. In a nutshell, the Gym Movement Protocol is about using mobility tests as biofeedback to determine what exercise, load, tempo, volume is appropriate for you in a given training session.
Generally, a training session using the Gym Movement Protocol would look something like this:
*Perform a movement "baseline test" (such as a toe touch) and stop at the point where you begin to feel tension
*Perform a set of an exercise
*Re-administer the initial test and comparing to baseline performance. If mobility improves, then the exercise is a good one for you to do this training session. If mobility deteriorates or stays the same, then you should try a different exercise or variant (and retest)
I've been experimenting with the protocol in my own training. Have I "drunk the Kool-Aid"? Well, I hope everyone knows me well enough by now to know that, aside from time, persistence, and mindful effort, there are few things I have "blind faith" in. I still have questions, but I am enjoying seeing how things play out for myself and others.
For more information:
Grip and Rip Review (April, 2010)