Tai chi is an ancient Chinese martial art. Initially developed for combat and self-defense, for most practitioners it has evolved into a sport and form of exercise. As an exercise, tai chi is performed as gentle, low-impact movement in which practitioners perform a series of deliberate, flowing motions while focusing on deep, slow breaths. Often referred to as "meditation in motion", tai chi aims to concentrate and balance the body's purported qi, providing benefits to mental and physical health.