Abstract: An adjustable rock arm of a climbing treadmill, including a swinging unit including a rock arm and an oil cylinder. A rear end of the rock arm via a shaft is pivotally connected with the upright support. The oil cylinder is disposed under the rock arm. By means of a fixing bracket, an upper end of the oil cylinder is connected with the rock arm. A lower end of the oil cylinder via a fixing member is fixed on an upright support. The oil cylinder is restorable and adjustable in tension and pulling force so as to provide different resistance against the rock arm for exercising a user's arms to different extent.

Abstract: A treadmill with a lifting device includes a main frame, a platform pivotally connected to the main frame and a lifting device mounted to the main frame and the platform. The lifting device includes a power supplier mounted to the main frame and a folding structure connected to the main frame and the platform. The folding structure includes a buckle device for holding the platform in place when the platform is fully lifted.