The pain-relieving powers of Tai Chi have been demonstrated before, but never in so large a study. This time, Science Daily reports, researchers at the University of North Carolina School of Medicine studied 354 people from 20 sites in North Carolina and New Jersey. Participants were randomly assigned to two groups: one received the 8-week, twice-weekly Tai Chi course; and the other did not. After eight weeks, those in the Tai Chi group showed moderate improvements in pain, fatigue and stiffness. They also had an increased sense of well being, and improved reach and balance.