Jumpstart your in-home fitness routine with the SF-B1879 Synergy Magnetic Indoor Cycling Bike by Sunny Health & Fitness. Indoor cycling can strengthen your cardiovascular health and engage your core, arms and lower body with proper and consistent exercise. Experience a ride like none before with Synergy's exclusive innovative patented flywheel design, developed to produce more momentum and smoothness than standard flywheels. The belt drive system coupled with the magnetic resistance and this spe