I just might consider taking up Tai Chi if they spin it to dissociate from an "older person's exercise". Like re-branding it with a snazzier name, set it to new age music, or pair it with TheraBands. And what's with the baggy pants and Chinese tops stereotype?
NOT any exercise will do. Some may do more harm than good. Will sit-ups go the way of the dodo like star jumps, frog leaps and duck walks?