Look at this, hard science is finally admitting it.

Tai Chi Exercise Reduces Knee Osteoarthritis Pain In The Elderly, Research Shows

ScienceDaily (2009-11-01) -- Researchers have determined that patients over 65 years of age with knee osteoarthritis who engage in regular Tai Chi exercise improve physical function and experience less pain. Tai Chi is a traditional style of Chinese martial arts that features slow, rhythmic movements to induce mental relaxation and enhance balance, strength, flexibility, and self-efficacy. ... > read full article