The “Muscle/Tendon Change Classic” ( Yijin Jing)  , is a manual containing a series of exercises, coordinated with breathing, said to enhance physical health dramatically when practiced consistently. In Chinese yi means “change”, jin means “tendons and sinews”, while jing means “methods”. While some consider these exercises as a form of Qigong, it is a relatively intense form of exercise that aims at strengthening the muscles and tendons, so promoting strength and flexibility, speed and stamina, balance and coordination of the body. These exercises are notable for being a key element of the physical conditioning used in Shaolin training.