ABSTRACT
Timing to Suggest Force: Repeat Action In a repetitive to and fro action such as sawing, it is not suffi cient to draw the forward and backward extremes and then inbetween them. To convey the feeling of eff ort being put into the action, it is necessary to analyze the relationship in time between the movement of the body weight, the muscles of the arm, and the action of the saw. This can be done by actual or mental miming. If a lot of eff ort is needed to push the saw through the wood, this cannot be supplied by the arm muscles alone, as straightening and bending the arm would move the shoulder back and forth as well as the saw. Immediately before straightening the arm, the whole body weight must be moved forward, so that when the arm does straighten it does so against the forward momentum of the body weight, and so the thrust is applied to the saw. The thrust is increased by rotating the shoulders at the same time.
