Working with TennisFlex on Rendy Lu: isometric exercise to stabilize the shoulder joint in the functional chain during a forehand motion. Through this TennisFlex exercise, I was able to help Rendy Lu extremely quick out of a situation of pain in the right shoulder joint. It happened after warming up the serve just before the match. This pain situation was as follows: Sharp pain radiating from the shoulder into the arm until the wrist in the movement range of 80 and 120 degree abduction of the right arm (also called as painful arc) - beginning in the region of the tuberculum majus, as well as tender right between the anterior and lateral part of the deltoid muscle. A similar symptomatology as the impingement syndrome. After a brief myofascial treatment, and subsequent stabilization exercises with TennisFlex was the shoulder pain gone. The Tennis Flex is a true enrichment of my therapy offer, because I can get the athletes much faster stabilized after the deep treatment. So far the athletes after such deep treatment felt a bad timing, but this is quite normal because the fascial structures and the treated body part are realigned. For a certain time it can´t be controlled as they used to it in the specific movements. That is because of a slight disturbance in the neuromuscular control, which is not pathological but requires normally a certain adaptation period of 1-2 days. So I don’t usually use this deep treatment techniques just before a match. But if a player, as used in this case "Rendy Lu" just before the match is coming to me and says it hurts in the shoulder, there is no other way to make it, because these techniques working incredibly quick and effective. In this case, e.g. Rendy Lu could play the match without pain. Fortunately, we had a camera man in this situation in our team, who was hired by adidas shooting a documentary about Rendy, due to the upcoming Olympic Games. Therefore, all details have been recorded live! I have to say the TennisFlex enables completely new possibilities in the hobby, amateur and professional sports!