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Submitted for publication October 1992. Accepted for publication May 1993. methods one can use to enhance dynamic performance, there appears to be three distinct schools of thought as to which method would result in optimal performance gains in dynamic sports such as sprinting, jumping, throwing, and so on. These include: 1. Traditional weight training, where relatively heavy loads (80–90% of maximum) are lifted for relatively few repetitions (4–8 repetitions). This method is seen to result in optimal increases in strength (5) and has also been reported to enhance power and movement speed to a greater extent than training with relatively light loads (21, 23). These findings are rationalized based on the size theory of motor unit recruitment (19), which implies that to train the fast twitch motor units, which are dominantly responsible for dynamic performance, heavy loads must be used in training as only heavy load …