The art of standing still.
Tai Chi seems to be the opposite of the kind of PE which I was taught by a cpl of sadists in the 1960s. The emphasis is on how slowly and peacefully you can perform the exercises and on thinking about what you are doing.
The first stage of wu chi just consists of standing still with the legs slightly bent for three minutes. It is when you panic and say "I haven't got three minutes" that you suddently realise what your original problem was :)
I was apprehensive when my daughter brought home Lam Kam Chuen's book. It is published by Gaia books and sounded ... well a bit "Forest Row" is the term used in East Grinstead! but we persevered and I just feel that this method addresses all the muscles in the body without causing pain - which was the cornerstone of PE as it was taught when I was at school :)
I am already considering passing Tai Chi on to friends and students in small doses....though I do not know what my PE colleagues will think!