1. An understanding of the basic physical concepts involved in exercise and the appropriate use of units of measurement is important to a professional who works with athletes in conditioning, performance testing, and injury rehabilitation. 2. The basic physical variables of human performance that are routinely assessed are force, torque, work, and power . These variables are easily related to each other by the inter national units of measurement: newton, meter, joule, second, and watt. 3. Strength (maximal force) can be measured in many ways, but the repetition maximum (RM) system is proposed as the most practical for use in athletic training. 4. Power is proposed as the most important factor in assessing a person's capacity for performance in sport. Power can be deter mined for a single movement, for a deter mined number of movements, or for continuous rhythmic exercise.
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