dr. steve salvatore. welcome to dr. steve! [ applause ] dr. steve. >> how are you? >> good to see you. >> great to have you here. dr. steve, i got to tell you -- and i, but why does it work so well? >> you know, regis, i'm not surprised it worked for you. tai chi has been around for literally hundreds of years. it's helped millions of people with flexibility and balance problems, make them feel younger and stronger. in fact, it's been clinically proven that doing these gentle movements will not only help strengthen your muscles and joints, it'll help improve your balance and mobility. tai chi is also proven to help relieve pain from arthritis, osteoarthritis, fibromyalgia, low back pain, many different types of joint pains. >> well, how did dr. cheng come up with this in the first place? >> all right, so, dr. cheng is a tai chi master. he's a martial-arts expert, and he has a phd in sports medicine. so he knew about tai chi and he knew the benefits and he thought, "i want to put all these things together." he americanized it and put that into tai cheng, a simple, ea