First thought is that you can ask the same some skier or golf player.
Answers on this question are similar:
- get fit and healthier
- enjoy the game
- show off
- get out “negative energy”
- enjoy and relax
Simple conclusion is that if you you play better you will fulfill all above “wishes”. Now, the trick is what to do to improve fast. The irony is that it is more simple then most of people can imagine. At least concerning One Handed Backhand, Forehand, 2-H-Backhand and Backhand Slice.