Hi Alberto, the wrist dance happens before contact.

At contact the wrists stabilize for a typical backhand. For short cross court shots the wrists may drive the racket head further…

Also keep in mind that all exercises in the biomechanics section and in tennis in general are exaggerations.

The goal of the wrist dance exercise is to give the player the sensation of wrists moving / having a range of movement so that they can contribute to the whole stroke.

But the actual exercise is an exaggeration.

I don’t think I have any exercise in any of the courses that does EXACTLY what actually happens in a real stroke. 🙂

I hope you understand that.

Teaching movements is completely different than analysis.

Analysis is exact, teaching is talking in some way to the brain and body and giving them information about the range of motion and feel so that the brain can build a large database of possible movements FROM WHICH it will then (subconsciously) select the appropriate AMOUNT of movement and force depending on the current situation – meaning what kind of ball are you receiving and what kind of ball you want to send out.

In tennis we constantly have to adjust to each different ball and it’s your subconscious brain doing that way faster than you can consciously think.

It can do that if it has a large database of possible movements and their range of motion / force – therefore we do exaggerated exercises in training to put all the movements into the brain.