This is another prime example of getting out and actually doing it is more beneficial than doing it in a gym. Stationary bikes are good for your health and can most definitely burn calories, but nothing beats the real thing. The faster you go, the more calories you will burn of course. Race a friend up to 20mph and you could burn well over 1,000 calories per hour. If you have to stay in and use the stationary bike, treat it like the elliptical and take advantage of the built-in modes.