How do the best tennis players hit so hard?

Question

Is it mainly technique or muscle?

Answer 1

it's skill. the more you practice at something the better you get.

Answer 2

I would picture the person I dislike the most and imagine the ball was their head.  I know that would make me hit harder

Answer 3

The answer to this... is the same as the answer to the question:  How do you get to Carnegie Hall.

Answer 4

muscle and you have to get a really good swing !!!!

just a guess !

Answer 5

In my opinion its both, because in order to hit hard, you need muscle, but to aim in the correct place and everything, you need technique.

Answer 6

More of technique. Tennis is a game of fluid motion and movement. The muscle perfects the shots, but technique is much more important.