tai chenma flexible. it improves your balance. it takes away your aches, your pains. it makes you feel younger, stronger. it works! joy and i love it. but the big question is, why does it work? to help us with that, please welcome emergency-room physician 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 -- tai cheng worked wonders for joy 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