Start a new in-home fitness routine with the SF-B1851 Synergy Pro Magnetic Indoor Cycling Bike. The Synergy Pro bike is one of the most advanced Sunny indoor exercise bikes. The innovative patented flywheel adds additional momentum to the ride. It works in sync with its advanced magnetic resistance system and makes riding extra smooth, solid and quiet. Ergonomically designed, this bike has a rounded multi-grip handlebar and 4-way adjustable seat that can help maintain your comfort and stability while you exercise. Cycling on an indoor bike is a low-impact exercise that can strengthen your cardiovascular performance and engage muscles in your arms, core and legs.