Cycling trainers convert road, mountain, BMX, tandems and recumbent bikes to a high performance, indoor exerciser. Simply attach your bike and begin pedaling. Like an outdoor ride, you can use your bicycle's gears and the faster you pedal the harder it gets. Competitive riders will benefit from the precise interval training. Recreational riders will benefit from the expanded training time. Anyone with a bike can now exercise anytime in any weather in the safety of their own house.