Tendons are what the common people call tendons. Tendon is a component of muscle, and muscle is mainly due to the two parts of muscle belly and tendon. The muscle belly is commonly known as the muscle, and the tendon is the part of the muscle belly that gradually becomes thinner, denser and whiter at the distal end. This part is mainly due to some dense collagen fibers, elastic fiber composition, its main role is to conduct the muscle contraction and the resulting tension. Because the tendon is connected to the muscle belly at the proximal end and attached to the bony prominence at the distal end, it can make the body make corresponding movements through the transmission of tension, so the tendon is very important for the human movement system. When the body does too intense exercise, it may cause the tendon to be overloaded, which can cause strain. If this occurs, it can be characterized by significant pain around the tendon and severe restriction of movement.