This video demonstrates additional technique tips when hitting an overhead. The most important tip is to get into a sideways body position, point your paddle toward the ball, and follow through completely while maintaining your sideways positioning.
When you see the ball coming up in the air, you’ll want to go from the ready position, turn, step, and hit. If it’s windy, you’ll want to move your feet to keep your body in position. Remember, when you go to hit the ball, you don’t want to rotate too much because then you’ll pull it wide. You want to just hit it straight up. It’s also important to relax. If you start to get tense, you won’t be able to hit the ball as far and as fast.