Between each shot, release the tension in your hitting hand by learning to capture your racquet in your other hand. This keeps the hitting hand from becoming fatigued during a point. It also prevents you from squeezing the racquet tighter with each strike of the ball. Between points in a rally, open your fingers on the hitting hand to release tension so you can change grips easily and react quickly to the next shot.
You’ll notice that pros hold the racquet in the non-hitting hand between points, and they usually hold it by the throat so it is balanced and does not hang down. A racquet that hangs pulls the shoulders down and decreases body energy. This creates a negative body position. Between points, keep the racquet head up as a sign that you are still up.
When waiting to receive serve, keep your hand lightly on the grip. Tensing up too soon slows down your preparation and slows down – or prevents – your ability to change grips.