His physics is funny though, almost like the round cow. It's an oversimplification that is born out of our need to understand the world in terms that can be held in our simple meat computer all at once. Like the round cow, it's nice and easy, but just not practical. Maybe it's more complicated. Like for instance his assertion that you lose 1oz for each hour of activity. Other studies have shown that even at less than 1 hour of activity, you change your metabolism for more than 24 hours. That readout on the treadmill has almost nothing to do with the benefits of working out since muscle requires more energy to function, your body believes that it must be more ready for future activity and your entire system stays at a higher level for hours. Plus, when you work out you also decrease your appetite overall and you increase your mood, which reduces emotional eating. It's also been shown that a depressed mode, even when adjusted for lethargy, increases fat deposits and weight gain. So working out, feeling better and reducing depression may also lead to decreased weight and have nothing to do with how many joules of work you did on the stair stepper.