do da
well, the fact that you atleast acknowledge tai chi as a martial art is something...most people just think of it as martha stewarts new age stress reliever
and yes, it is the same, when people say "Tai Chi" they mean Taichichuan, or Taijijuan
as simply as i can put it, Taiji is a martial art, it is very powerful, it branches out into a few different styles or lineages( Yang, Chen, Sun, Wu, Wu') it is considered an "internal" or soft martial art because it places emphasis on building up internal energy or "chi" to direct movements and its forms are usually done slow, although being a complete system of Traditional chinese martial arts it is in actually both internal and external, external meaning that it places emphasis on combat applications and such
what interests me about taiji and shaolin gong fu is that they both use techinques of uniting the mind/body/spirit and through that, they achieve nirvana, they say that taiji at first was not even meant to be used as a spiritual practice it became a by product over the years because of the way it is trained, there are many legends and such of taijis original origin which i wont go into here, but its said that when a wudang monk trained at shaolin temple and learned shaolin long fist, he came back to wudang and compiled it with what he knew to make taiji, and through the training at shaolin monastery his form of martial art became basically a vehicle for enlightenment, just as shaolin gong fu is for the shaolin monks
of course not all monks in the shaolin and wudang sects trained martial arts, some were "martial monks" others were just monks
also, not everyone that trains martial arts in china or wherever see it as a vehicle, or even ackknowledge it as being spiritual..although most do, it is interesting to note that most popular systems of martial arts in china were greatly influenced by shaolin and wudang, and some can even draw their lineage directly back to shaolin
so that really poses another interesting idea of being mindful really, cause its not that laymen or other practitioners of the arts didnt train properly(even though alot of the martial arts were debased after leaving shaolin) but that they just dont train that aspect of the art..
anyway nough said i suppose
amitabha