"Make sure you hit up on the ball." It's an extremely common piece of advice on the serve, but it's a bit unclear. I always took it to mean brushing up the back of the ball with a closed racket face (perpendicular to the ground). While learning how to serve a volleyball, I began to wonder if I misinterpreted. To serve a volleyball overhand, you have to, very litterally, hit up. That means the hand would be angled upward on contact. Considering this, I wondered if players should be "hitting up" in this manner on a tennis serve as well. I tried it out and had some mixed results. My 1st serve seemed to benefit. It got a little more powerful and went in with pretty good consistency. Topspin serve got less consistent though. I'm not sure where I stand on this issue. Thoughts on this?