Tennis players are taught to hit the ball with a flat-palmed 'slap' shot. In executing this stroke, the player reaches across their body and powerfully rotates their upper arm. This technique stresses the extensor muscle group of the forearm (a.k.a. golfer's or tennis elbow). It can lead to injury to one or both of these muscles as well as inflammation caused by compression injury and swelling of tissues near the radius( a particular part of the ulna). Professional players ma