LifeTrac Pro Air BikeTHE ENDURANCE BUILDING, GUT BUSTING, POWER CHARGING BEAST OF A MACHINE, THE NEW STANDARD IN COMMERCIAL AIR BIKES. The LifeTrac Pro Air Bike is an upright stationary exercise bike with handles, also known as a fan bike. The resistance is provided by a fan wheel that exponentially increases wind resistance as you pedal harder. The intensity of exercise on the LifeTrac Pro Air Bike completely dependents on the person exercising. You can exercise your lower and upper body at the same time, or exercise independently. Make it burn.