Abstract: This invention relates to a control valve for an exercise stair device comprising a cylinder having three nozzles, a spring disposed within the cylinder, a ferrule mounted on the spring, a valve plate fitted on the ferrule, a piston housing the spring, the ferrule and the valve and disposed within cylinder, a spring-loaded spline inserted into the piston and supported by the frame of the piston, and a lid engaged with the upper ends of the spring-loaded spline and the piston, whereby the exercise stair device may be easily adjusted to adapt to the needs of various users.

Abstract: This invention relates to an exercise stair device and in particular to one mainly including a base having a cavity at the bottom and a raised portion with two recesses, two inflatable balls each disposed in a corresponding one of the recesses and being communicated with each other via a U-shaped tube, a cover engaged with the cavity of the base, and two pedals pivotally mounted on the base and each having spherical protuberance at the bottom adapted to be received in the corresponding one of the recesses of the base, whereby when one of the pedals is pressed downward on the corresponding inflatable ball, the inflatable ball will be squeezed by the pedal thereby forcing the air in the inflatable ball to go into the other inflatable ball and therefore lifting the other one of the pedals.