Tai Chi - more than a martial art

So, tai chi. You might think that tai chi is just people moving their arms and legs into strange postures verrryyy ssssllllllloooooowwwwwwwllllllyyyyyy, and, I suppose, part of it is. But, tai chi chuan is definitely a martial art. It has very soft techniques, and the slow-limb movement thing is just a training form. The gentle movements bring all round health to the body, encouraging movement inside the body (blood flow, breath, the movement of food).
Tai chi is used for much more than self defence - it is used to help the old and injured get back some of their energy and vigour, and is related to Traditional Chinese Medicine. Tai chi was proved to help some illnesses, and it is popular worldwide.
Some links - http://www.everyday-taichi.com/learn-tai-chi.html - there for information and techniques.