Coach Mark Rippetoe introduces the basic terminology, vocabulary, and muscular awareness necessary to understand human movement.
This footage is taken from his Basic Barbell Certification seminar at CrossFit Brand X in Ramona, CA on February 14, 2009.
In this video, Rip explains the proper lumbar mechanics required for squatting effectively. Awareness of the pelvis and the musculature of the lower back is essential. A slight anterior pelvic tilt is generally required at the start of the squat so that lumbar stability is not lost at the bottom of the squat.
Rip says that a significant percentage of athletes are not even aware enough of the lumbar spine to know when they lose their arch while squatting, deadlifting, or even grabbing something casually off the floor.