Current knowledge in the area of muscle physiology is a basis for a discussion on strength training programs. It is now recognized that the expression of strength is related to, but not dependent upon, the size of the muscle and is probably more related to the ability to recruit more muscle fibers in the contraction, or to better synchronize their contraction. Isotonic strength training is the most widely used form of strength training. Theoretically, isokinetic training, which taxes muscles to the point of fatigue, offers a tremendous advantage over other traditional forms of strength training. Accommodating resistance is another acceptable form of strength training. Circuit weight training is effective and should be used as a means of keeping physically fit during off seasons. Strength training should be as specific to the sport as possible, and, when working with any highly skilled athlete, one must make sure that performance is not negatively affected by the program. (JD)