Now you can use your bicycle every day with the help of the Cycleops Mag trainer. It's the perfect solution for still riding your bicycle even when it's too cold, wet or dark to go outside.  To make it more life-like, the Cycleops Mag trainer features five adjustable levels of linear resistance to accommodate your workout. With the power to vary your effort and an included training DVD (US only) you'll pass the time with ease as you pedal your way to better fitness.