well, in a month from now, when those #$%@ exams at university finish, I am starting training in BJJ. There are some things I would like to ask, if you have any good answers, your help would be greatly appreciated: 1) How does BJJ transform your body? Can you actually gain lean muscle by training (yes, I would really like that...)? Or the aerobic part of training consumes all your muscle size? 2) Do you have to weight-train with a specialized program, to support your grappling game? 3) How often can you get injured? Is there something I have to pay special atteintion to (apart from tapping out in time, of course)? Thanks in advance for your help.