That's absurdly high. If you can sustain that level of activity, you likely don't have the weight problem in the first place. I'm a couch potato, I can burn ab

That's absurdly high. If you can sustain that level of activity, you likely don't have the weight problem in the first place. I'm a couch potato, I can burn about 300 cals per half-hour (according to the stationary bike machine or elliptical). In my better days, that was up to 350 cals per half-hour, I was quite fit but not athletic.