Abstract: The present invention relates to a stair stepper, including: a rack provided with two slide rails, each of the slide rails is slidably provided with one pedal component, where the two pedal components form linkage in the form of reverse synchronous movement; and a damping mechanism, including a linear elastic element, where the linear elastic element is straddled between the two slide rails, two ends of the linear elastic element are respectively connected to the pedal components. The linear elastic element expands or contracts with the reverse synchronous movement of the pedal components, to form a changing elastic force, and the changing elastic force acts on the pedal components, to form resistance to the movement of the pedal components.

Abstract: An exercise machine creates a simulated continuous resisted climbing motion. The machine includes a floor- or ground-contacting base frame and two or more substantially vertically oriented uprights, wherein at least one upright is rigidly connected to the base frame. The machine further includes two handles and two foot pedals, each handle and each foot pedal being movably engaged with an upright for linear reciprocating motion along the upright. The handles and foot pedals are interconnected so that they move concurrently. An adjustable resistance mechanism may be operatively connected to the interconnection of the handles and foot pedals to provide adjustable resistance for the simulated continuous climbing motion.