IC-9000 Commercial Self Run Curved Treadmill5 Levels of Resistance. This is a new concept green treadmill which adopts an elastic rubber arc running deck, crawler running belt lamination technology. Using gravity to start, accelerate and decelerate and controlling the speed freely, the product overcomes the impact to the knee due to the failure of footsteps to keep up with the running belt in passive running, radically puts an end to the traditional electric "passive" running way and realizes