I agree with DropBear, there was some douchbaggery going on. I also agree with KangTsai, that if your fitness level was better and your ability to move (not being able to get to the ground quick is a huge problem in arts which use lock submissions)(. I combine both of the above statements into the class was, even if unconsciously, trying to drive some sort of point home. This is my opinion. Problem is, the end result... what your doc said... I have to contradict you, that is rather spectacular! I mean, whoa... here's what you said: "According to my doctor this afternoon I had a dislocated left shoulder, broken metacarpals on my right hand, strained right groin, strain lower right back, and an over sense of brokenness and humility." And you got about half of that in the first class and you WENT BACK two days later. That, in itself, is showing some great intestinal fortitude. I agree again with Drop, a boxing gym is a great fit because of the extreme aerobic exercise you'll have to put yourself through. Just take it easy, and stepwise. Don't expect to be able to do a typical 20-round workout your first day. Best find a boxing club, go in and talk to one of the old guys,a nd get a plan. Follow the plan, and keep written hnotes on paper or in your phone. Don't push too hard at the outset, but each day go just a ... ittle... farther, a ... bit ... more energy consumed. Best of luck, but I think you can do it.