Some operators are introducing limits on the number of sessions seniors can attend and requiring them to re-enrol. SINGAPORE: An avid tai chi practitioner, Madam Miranda Hsieh had long considered herself an active person. But in recent years, the 63-year-old noticed subtle signs that her body was no longer keeping pace. Crossing the road became unexpectedly challenging. “You want to go faster, but it’s a bit more difficult,” she said. Bending down and standing up also required more effort than