It was first used as a rugged form of self-defence.
It then became influenced by Taoist meditation practices.
Although it retains its fighting applications, it's practised for improving
ones health, concentration and mind/body co-ordination.
It's about not wasting energy. Not using too much, resulting in exhausting
oneself unnecessarily. Tai Chi Chuan facilitates a wakeful relaxation.
Tai Chi Chuan shows one how to constantly have a reserve of mind and body
energy available.