Tennis elbow (lateral epicondylitis) refers to an damage for the outer elbow tendon that occurs after arduous overuse from the muscles and tendons in the forearm, in close proximity to the elbow joint.  Armband: Similar to a counterforce strap, an armband applies qualified strain on the muscles and tendons throughout the elbow. https://www.theorthopaedicandpainpractice.com/how-to-alleviate-tennis-elbow-pain-tips-from-a-medical-expert/