RETREAT study was a 12 wk RCT of Tai Chi in 178 knee OA pts Rx w/ online OA info vs same plus free web based tai chi video program. Tai Chi group had signif improved knee pain (−2.7 v -1.2); (−12 v −6.9) & achieved a minimal pain & function (73% v 47%); and Its free! https://t.co/WLzQ9YHrcu