All-Surface Wheeled SledMAGNETIC RESISTANCE SLED ALL SURFACE WHEELED FITNESS SLED Push and pull your limits with the Heavy Duty Magnetic Resistance Sled, designed for intense resistance training on any surface, including turf, rubber, asphalt, and even concrete. Unlike traditional friction based sleds, this wheeled resistance sled features an 8 speed magnetic resistance system, allowing you to increase or decrease the challenge without relying solely on added weight. Need