Tennis elbow (lateral epicondylitis) refers to an personal injury for the outer elbow tendon that occurs right after strenuous overuse in the muscles and tendons with the forearm, near the elbow joint.  Roll the towel up so it’s a cylinder. Starting with the overhand grip, grasp the towel with both equally palms. https://www.theorthopaedicandpainpractice.com/how-to-alleviate-tennis-elbow-pain-tips-from-a-medical-expert/