EPTE Inertial Concept is an isoinertial training device created by Spanish specialists. From the very beginning of its development, the device aims to be one of the most effective tools for functional therapy and the prevention and rehabilitation of many types of injuries. Using the EPTE Inertial Concept, we will simultaneously develop and improve the strength of muscle mass in our patients (also applicable in sports) and prevent future injuries. With this device, it is possible to increase the eccentric phase of muscle work in the most effective and modern way on the market.