well, I've heard a lot of people saying you should always stay on the ground or keep your foot on the ground when striking the ball. I JUST LOVE TO CRANK MY FOREHANDS!! I've also notice that when I do this, my strokes are full swings and I get good pace. I also hear that power comes from your legs and racket speed. I feel really comfortable with them, but is it nessary to not leave ground? Any comments would help.