Change your service the same way that Djokovic and Nadal changed theirs!
In 2010 some of the best players in the world changed the take back of their services.
This was because the science of biomechanics made it clear that this “trophy pose” position enabled all of the major muscle groups of the upper body to be engaged at once…
This precise movement is thought of as very difficult to learn.
But using two simple factors, it can be easy and quick to achieve.
First, if the tennis racket and the ball tossing arm are parallel then you have achieved, it is very close to achieving a perfect “trophy pose”
Second, to find that perfect position, aline your Shadow so that you can see it clearly, and then practice the ball toss… Checking that your arm and racket are in a perfect position by setting the staggered shadows!
Put the “Trophy Pose” into your service.