“More than 90 percent of all tai chi is bad. What it mean—‘bad,’ that when you see someone do tai chi, they don’t follow the principles. You don’t know the principles yet, but you can look for yourself if the tai chi is good or bad. When you look, look at the waist. When the tai chi is good, (they) always turn the waist. When the tai chi is bad, the arms move but the waist doesn’t turn, or the waist only turns sometimes. That’s principle. In good tai chi, the waist always turns.”.