The lifts coached as we teach them require no stretching. Except for possibly the lockout position of the press, flexibility -- "mobility" in the modern faddish terminology -- is not the limiting factor in squat depth or starting position for the pulls. Over the 10 years we have been holding our seminar, there have been a total of 5 people who could not squat below parallel on Saturday morning after 8 correctly-coached sets of 5.