In terms of upper and lower body workouts, I have to say, I do better concerning the lower body ones. All the upper body workouts that I've done have been extremely difficult, if only because I don't have much muscle. At first I had difficulty with the lower body workouts as well but with plenty of practice, I've gotten much better and I know that if I commit to working out my upper body like I did for my lower body, I'll be in great shape and I have started, a bit slowly though and the two exercises that I have found to be the most beneficial are strength and resistance training. It's plenty of work but you can start out on your own pace and build up to more difficult exercises.
It is impossible for a person to hold their breath long enough to pass out because our body has the ability to control the breathing mechanism itself without influence from outside causes.
