Athletes that have sustained muscle injuries are under pressure to return to a sport as fast as possible and have furthermore also limited access to relevant information on the status of their muscles. As a consequence reinjures and chronic injuries are common. As athletes have to optimize their rehabilitation and each one of them recovers at different rates, they and their coaches need to make educated decisions. Most of the clinical studies that enable muscle injury and rehabilitation diagnostics provide information on muscle status when no load is applied on measured muscle. TMG S1 system on the contrary provides also information weather the muscle is capable to sustain maximal load and supports athletes, coaches and medical staff with relevant and complete information on injured muscle and enables them to make the fast but safe comeback.