Incidentally, here's a bit of nostalgia for the older people who remember when Robert Smith was writing about the wonders of his teacher, Cheng Man Ching:
http://www.youtube.com/watch?v=i9BfbqAbprk
Compare Cheng's body motion with someone like the O.P.'s video Li Chugong, who I only know as someone who is a student of Hong Junsheng (who does a variant of Chen-style Taiji).
FWIW
Mike Sigman