This drill is a good way to help develop a good top spin serve. Grab
a bucket of balls and try standing behind the baseline back
up almost against the fence (or wall). The goal is to still
serve the ball into the correct service box, but using all
spin. You should use as much arc as you can created by just
spinning the ball. But here's the kicker, don't use your legs
to help serve the ball, this is simply a drill to help you
develop topspin on the ball. Generate as much spin as you
can using your arm and wrist.
Good Luck on the Court!!!