Question: Should I use any wrist motion on my forehand?
Answer: Turning your wrist as if you were turning a doorknob is just about the worst thing you can do to your ability to control your forehand. The somewhat popular notion of rolling over the ball to produce topspin is quite silly. Just a couple of degrees of tilt in your racquet face will readily send your shot into the net or long, and there's no way you can time the rotation of your wrist to put the racquet face at just the right angle during the few thousandths of a second that it meets the ball.
One kind of wrist motion can be helpful, though: laying your wrist back as you prepare to swing, then letting it sling forward in response to the larger motions of your arm and body. This isn't a technique for beginners, but it becomes a natural and fairly safe way for more experienced players to generate additional racquet-head speed.
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