Lifespan Fitness EXER-90H Exercise BikeThe Exercise Air Bike fits any athlete of different fitness levels. The Air Resistance System makes every pedal you make to scale the effort you put into it, the harder you push the harder it gets, best for all adrenaline junkies out there. An Unlimited Workout With an exponential and dynamic Air resistance system, the EXER 90H will suit any fitness level for a great workout. Air resistance scales with how hard you want to work, so the harder you