Flexibility: A Concise Guide

In 1964, at the beginning of my PhD studies at Southern Illinois University, I was first introduced to the theory and practice of proprioceptive neuro­ muscular facilitation (PNF). One specific application, reversal of antago­ nists, particularly intrigued me, and served as the focus of not only my dissertation, but also numerous research projects, presentations, and pub­ lications over the ensuing years, including the monograph Scientific Stretch­ ing for Sport (1973). This was the first public