On the suggestion of a Chinese physician the author took up Tai Chi, a traditional Chinese exercise, in an attempt to relieve symptoms from his moderately severe ankylosing spondylitis. Conventional medical therapy, used over a 15 year period, had proven of only limited benefit. Tai Chi consists of a series of intricate exercise sequences, and after 2 1/2 years of daily practice the author now feels stronger and healthier than before. Pain, weakness and general malaise return if practice is neglected for as little as one week. It is felt that Tai Chi is of value in minimizing the flexion deformity of the spine. Improved skeletal muscle strength, limb co-ordination, balance, chest movement and ability to relax are further benefits.