must not exceed the muscle strength moments at that joint. Where, Sj is the muscle strength moment at joint, j, and Mj/L is the external moment at the joint, j, due to load, L and the body segments preceding the joint in the top-down analysis. Top-down analysis is the method of calculating the reactive moments and forces at each joint starting at the hand, all the way till the ankle and foot. In a 6-segment model, the joints considered are elbow, shoulder, L5/S1 disc of the spine, hip, knee and ankle. It is common to ignore the wrist joint in manual calculations. Software intended for such calculation use the wrist joint also, dividing the lower arm into hand and forearm segments. Prediction of static strength Static strength prediction is the method of predicting the strength capabilities of a person or a population (based on anthropometry) for a particular task and/or posture (an isometric contraction). To predict capability, manual calculations are usually performed using the top-down analysis on a six or seven-link model, based on available information about the case and then compared to standard guidelines, such as the one provided by the National Institute for Occupational Safety and Health. See also Super-strength References Athletic training Physical exercise Physical fitness