The human movement is 4 exercises that use body weight is 5 contracting muscle is 12 holding a contraction is 8 decreasing the angle is 6 strengthening is 3 increasing is 7 lengthening of a muscle is 10 maximum amount of force is 1 isolating muscles is 15 undesirable movements is 14 shortening muscles is 9 sustained contraction is 2 opposing action is 13 increasing the weight is 16