Originally Posted by Calor1
I can't be 100% sure but based on this vid it seems like there is something wrong with your grip.
And like the others said, toss too far behind you.
well I use continental for serves, semi-western forehands & extreme eastern backhand. I should bend my knees more on all the moves but as I mentioned earlier I wasn't athletic at all until I picked up tennis plus I have developed aching knees (difficulty to climb stairs, squatting etc).