Originally Posted by Power Player
Timing and technique gives you more power than just swinging hard.
I agree as I've just experienced that last night, when my hand was hurting after a return of serve.
Couldn't swing too hard, or at least it made me swing with no tension whatsoever neither in my grip, nor in my arm and it did wonders, especially since I was forced to hit 1H BH most of the time in those practice rallies...Found my timing, based on feel mainly and on longer swings.
It also reminded me of that poster with his "swing with minimum effort" video: