
Keeping your affected elbow at your side, bend that elbow a right angle.
Make an empty closed fist or, to make it a bit more challenging, grasp a thin object like a pen or pencil and then make a fist around it.
For the supinator stretch, rotate your palm up and pause for 5 seconds. Then, for the pronator stretch, gently rotate your palm down and pause for an additional 5 seconds. Be mindful of keeping your elbow by your side and bent at 90 degrees throughout the exercise.
Aim for at least 2 sets of 10.