Why do cricket batsman hit the pitch with their bats when the bowler is running up?

Question

I use to play cricket as a kid and I saw some on TV today and I was wondering why the batsman hit the ground. I use to do it but never questioned why.

Answer 1

To get the feeling and touch before playing your shot! When you hit the pitch it gives you a nice little touch and comfort and also confidence before playing the shot.

Answer 2

I just assume its to keep their concentration on whats in front of them and a timing thing