A treadmill includes an interaction assembly, a support assembly and a base assembly. A locking mechanism is provided at a pivot position between the support assembly and the base assembly. The locking mechanism can switch between an active state and a locking state. The treadmill is provided with an operating mechanism, a connecting mechanism and a driving mechanism which are connected sequentially. The operating mechanism is provided on the interaction assembly. The connecting mechanism is provided on the support assembly. The driving mechanism is provided at a pivot position between the support assembly and the base assembly. When the interaction assembly is rotated to switch from a use state to a non-use state, the connecting mechanism is driven by the operating mechanism and then the driving mechanism is driven by the connecting mechanism, so as to cause the locking mechanism to switch from the locking state to the active state.