Tai Chi began as a martial art. Today, it is practiced in various forms, from slow gentle movements to the level of a martial art. The best known form is a low impact, low intensity exercise which improves joint mobility, posture and coordination to build muscular strength and flexibility. Scientific studies show that Tai Chi helps elderly people to stabilize their bodies, improves cardiac function, balance and concentration; and relieves stress. Meditative in nature, Tai Chi quiets the mind, promotes relaxation and releases endorphins that produce a sense of well-being in the body. Tai Chi is safe for almost everyone and can be adapted for those with physical limitations.