https://www.newyorker.com/news/spor...ennis-to-beat-her-sister-venus-at-the-us-open Here’s what that developmentally secondary and underutilized arm and hand need to do: cradle the ball delicately, with all the fingers; firmly straighten the arm and slightly turn the forearm (without tightening the grip on the ball); and lock the elbow. Then, with the shoulder, not the arm—a completely unnatural movement—raise this oddly deployed limb calmly and continuously to the height of the eyes (while doing all sorts of other things, which I won’t get into here, with the dominant arm and hand, the legs, and back) and release the ball with a force such that it reaches a height to meet the racquet, fully extended above you. Got it? silly writing nothing so difficult just for throwing the ball into air !!