Running machine

The running machine comprises a main machine frame, a running belt and a supporting plate used for supporting the upper portion of the running belt are arranged on the main machine frame, a plurality of grooves are formed in the top of the supporting plate, an elastic claw part with an upward opening is arranged in each groove, and a ball is clamped in each elastic claw part. Each ball partially protrudes out of the top of the supporting plate and abuts against the inner side face of the upper portion of the running belt. Due to the fact that the grooves are formed in the supporting plate and each groove is internally provided with the corresponding elastic claw part, the balls can be elastically clamped in the corresponding grooves through the elastic claw parts, and the balls can freely rotate in the clamping space under clamping of the elastic claw parts and can also be clamped in the clamping space through the elastic claw parts. According to the running belt, the friction effect between the balls and the