Beware of artificial constructs that segment, compartmentalize and mechanize the body. They may be convenient but they misdirect and mislead. These artificial constructs have no connection to how the body actually functions outside of a sterile laboratory or clinical environment. Just because something is easy to measure does make it meaningful. A statistical correlation does not mean there is a direct causation. Coaching significance trumps statistical significance. Learn to use common sense, intuition and above all a well trained coaching eye that is acutely sensitive to subtleties in movement.