Why do some players get a sore arm?
The first thing tennis players need to check is the size of the grip. Look at the grip size, if small you’re going to have to hold the racket tighter to prevent any torque in the head of the racket. when you strike the ball, for example it would be like a big screwdriver handle, it is easier to put the screw into the wood with a bigger handle than it is for smaller one, so you must really as a first measure of prevention is you need to check is the size of your handle. I recommended change or build up to make the handle bigger so you can handle the torque in the frame.