ABSTRACT
It may seem strange that such basic physical actions as flexion and extension should require so many pages of explanations and examples. Experience has taught that with respect to these forms of movement people are surprisingly unaware of what actually takes place. Again, lack of definitive terminology has hampered the sorting out of the different possible forms. The complex structure of the human body, the different ranges of motion in the various joints and the movements made possible through coordinated use of joints, adds to the rich ness of movement possibilities and also the need for thorough exploration to establish a clear understanding of flexion and extension. Once the mind is alerted, the eye can differentiate between the forms.
