(photo taken @ Japan Consul Office)
Tai Chi Chuan is a kind of Chinese Martial Art with slow movement both for self-defense and health benefit, and that's longevity. I met a person, she's 99 year-old and I asked her what's her secret, she told me she's practicing tai chi everyday. My landlord before, teach tai chi every 6am and asked me to join them. I would love to, but being a full-time M.A. student and part-teacher, I didn't try. :(
I've only tried this when I'm still working out in California Fitness, but not much. My yoga instructor only introduced tai chi in the beginning of the session. Every morning, all the parks I've seen here have lots of people doing tai chi.
If you're a beginner, all you have to do is to stay at the back and follow what they do, not to disturb the rest of them. The instructror will come to you after the session, and teach some techniques. Isn't that amazing!