I know I should be in the air when the opponent hits the ball. My problem is I'm so afraid of jumping too early so that the jump becomes useless, that in the end I jump too late. I saw from videos that I left the ground slightly after the contact. What I was thinking was that "don't jump yet don't jump yet, hey he is about to hit, Iet me jump", but the "let me jump" took time from pushing the ground to leaving it, and in this period the opponent has hit the ball. Any tips to jump earlier while not being worried of too early?