Originally Posted by ishiun
benefits for pointing the buttcap to the ball on the forehand?
At the bottom of the take back, your wrist should be relaxed in neutral position with the palm facig down. Good players keep it that way so that they can cause the buttcap to point at the ball once they rotate. This 'buttcap to the ball' position enables you to trigger a muscular reflex (it's the myotatic reflex for those who are curious) that will basically make your hand move very fast.
Done right, you get more of everything. More spin, more control, more power... and it's easier to hit that way.
There's a video from virtual tennis academy teaching it in a simple way. The video is called forehad ssc. If you want the detailed explanation, go see on the blog of tennis speed.