This is driving me crazy!:angry: There are some times when I am exercising that I break out in this uncontrollable itching on my back and legs. What is it?

I just looked up quickly on the net and one website had this to say about it...
You may have cholinergic urticaria. These are hives induced by chemicals released during sweating or exercise. You can prevent these by taking an antihistamine 30-60 minutes before you exercise. Try thr OTC ones, like Benadryl 25 mg or chlortrimeton 4g. If thse don't work or make you too drowsy, ask a doctor for a prescription for a nonsedating one. There's no special reason why your body started reacting this way.

Does this happen to anyone else? UGH!!!

I always just thought it was my fat itching. Ha!HA! Someone once told me that it is due to poor circulation.

You may have a point about poor circulation. When I work out at the gym and use the steam room I don't seem to itch as much. They say that the steam helps to improve circulation as well as pull the impurities out of the body.