Foreword:      21% of the reasons for long-term exposure are caused by falls or joint disability. The KADA Lohas Foot Challenge Machine has been proven by Kyushu University in Japan, and through long training, it can improve the leg muscles that prevent falls. For example, tibialis anterior muscle, gastrocnemius muscle, quadriceps and rectus femoris. feature of product:      The "KADA Lohas Foot Challenger" product has been used in more than 200 sunshine and long-illumination centers in Japan.