The Relationship between Muscle Strength and Muscle Flexibility

It is often said that strength training has a negative effect on flexibility. For example, someone who develops large bulk through strength training is often referred to as "muscle - bound." The term muscle - bound has negative connotations in terms of the ability of that athlete to move. We tend to think of athletes who have highly developed muscles as having lost much of their ability to move freely through a full range of motion. Occasionally an athlete develops so much bulk that the physical size of the muscle prevents a normal range of motion. It is certainly true that strength training that is not properly done can impair movement; however, there is no reason to believe that weight training, if done properly through a full range of motion, will impair flexibility. Proper strength training probably improves dynamic flexibility and, if combined with a rigorous stretching program, can greatly enhance powerful and coordinated movements that are essential for success in many athletic activities. In all cases a heavy weight - training program should be accompanied by a strong flexibility program.
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