does anyone know the tai chi?

Only by name. I have heard of a number of martial arts but never bothered with them because I am too lazy to go alone and need someone to motivate me. I don't know anyone that would join me for such an activity, plus I lack discipline, so my experience is quite limited. However, if I decided to do a particular martial art, it would be Jiu Jitsu, because I've heard you can easily take advantage of the opponent's strength and turn it against them. That would be cool, because I'm pretty weak!