Many people like to talk about posture training such as San Ti Shi, ... as if only "internal" guys know about posture training. Here are some posture training that external guys do. There are much harder to do than the San Ti Shi.
http://img718.imageshack.us/img718/3319/chang13tb.jpg
http://img600.imageshack.us/img600/6512/13taibo5.jpg
http://img802.imageshack.us/img802/7051/13tbzz.jpg
http://img573.imageshack.us/img573/7...urrounding.jpg