The way I see it, is that it won't hurt to try. If your'e worried about your fitness, I think alot of these fight gyms are now a means to getting fit. If the trainers are concerned about your fitness they'll probably get you into shape instead of turning you away. You should probably ask to talk to somebody who runs the gym. It seems to me, that all these little self-concious concerns and fears turn into excuses that stop people from doing what they really want to do. It sounds like you're passionate about training, so just jump into it-- like go now, or tomorrow-- and ask them questions. Just my opinion. Obviously.