All it takes for you to fix your bike tyres to it, and you\'ll get the same fitness benefits as from using an exercise bike.The Mag comes with five adjustable levels of resistance so you can adapt every ride to your liking.Magnetic resistance unit provides a quiet and frictionless rideLinear resistance boosts workout intensity to match each pedal stroke and gear clickFeatures five adjustable levels of resistanceCompatible with Zwift and other indoor training apps