To compare results between individuals work is calculated compared to body weight (either kilos or pounds). Lower limb work is dependent on body weight and can be expressed in this way. Upper body work is less dependent and is not usually described this way. W(ork) = torque x angular displacement Total work (TW) = Area under torque curve x angular displacement (according to Hislop and Perrine 1967) Peak power (PP) = work done during the best repetition (often called best work repetition BWR) All described in J(oules) A measure of the energy expended by the muscle/s under test and considered by some authorities to reflect endurance. However, difficulties in assessing the importance of strength (or lack of) and endurance during the interpretation of these results makes their use questionable for research purposes but good for rehabilitation.