Tai Chi is a form of exercise that originated in China combining slow, graceful movements with deep breathing and mental concentration. There are several theories about its origins but it is based on Taoist philosophy of yin and yang and aims to promote health and well-being. Some key styles are Yang, Wu and Chen. It has many health benefits like increased flexibility, balance and immunity. Regular practice of its forms and movements can help with conditions like arthritis, back pain and stress reduction.