This book which provides treatment for conventional LBP Athletes.Muscle flexibility as the ability of a muscle to lengthen, allowing one joint (or more than one joint in a series) to move through a range of motion and "a loss of muscle flexibility as a decrease in the ability of the muscle to deform" Resulting in decreasing ROM about a joint. Flexibility is a physical fitness attribute and is often evaluated from the joint range of motion (ROM), an essential element of normal biomechanical functioning in sports.Flexibility is a physical fitness attribute and is often evaluated from the joint range of motion (ROM), an essential element of normal biomechanical functioning in sports.