Abstract: A lifting and folding mechanism for treadmill includes a base, a platform, a lifting mechanism, and a linkage mechanism. An armrest rack and a control panel are assembled at the base. A front end of the platform is pivotally assembled with the armrest rack. The lifting mechanism includes a supporting rack and a driving device. One end of the supporting rack is pivotally assembled with the platform, and the driving device is connected between the supporting rack and the platform for driving the supporting rack abutting against the ground, so that the platform is lifted and the slope of the platform is changed. The linkage mechanism is connected to the base and the platform. The linkage mechanism is in a connection state or a disconnection state. In the connection state, the base is connected with the platform, and the base is lifted upward with the lifting of the platform.

Abstract: An exercise bike includes a frame, a driving member, two sun gears, two swing arms, two planet gears, and two cranks. The driving member is assembled to the frame and has a shaft extending from two sides of the frame. The two sun gears, the two swing arms, the two planet gears, and the two cranks are respectively assembled to the two sides of the frame. For each set, the crank drives the planet gear to rotate so as to drive the swing arm to rotate the shaft, and the planet gear is rotated around the sun gear. Accordingly, a pedal connected to each of the cranks moves around the axis of the corresponding planet gear.