When You Serve.....
do you extend your arm all the way so that your elbow is locked on contact?
I have always served so that when my racquet makes contact, my arm is fully extended. I have found that recently my shoulder is taking too much abuse and I've started serving with a slightly bent arm. This takes a lot of the stress off of my shoulder. I do give up some power but seem to have gained some control.
Does anyone have any insight?