The massage gun, also known as the deep myofascial impingement instrument, is a soft tissue rehabilitation tool that relaxes the body's soft tissues through high-frequency impingement. The massage gun can be thought of as a civilian version of the DMS (Electric Deep Muscle Stimulator). The vibration rate varies when used, and the basic function is similar to that of the DMS. The massage gun is an effective method to treat soft tissue pain introduced from abroad. It stimulates its proprioceptive function, and then plays an effective role in relieving muscle tension and achieving the purpose of pain relief.