Very true wandering daisy. You also have to scale things to size, and lean body mass is probably a better indication of that than total body weight. I am 6' 210 pounds, and I have a fairly good aerobic capacity for my age, but its comparable to that of an average 165 pound runner, or an elite 150 pound runner, not a 210 pound athlete. I think I would like to try some controlled tests with a heart rate monitor to see how many calories I can burn in one day. I doubt it is as high as I think it is. I'll check it out again.