It sounds downright crazy, but Gym Jones manager Rob MacDonald proved that it's possible to blast 87 calories in one minute on this stationary bike that increases its resistance as you pedal harder.
The key: Give everything you have in that 60 seconds.
Note: This was by no means a scientific experiment, and relies on the accuracy of the built-in AirDyne monitor, which calculates calories by converting revolutions of the fan into physical work.