Folding Exercise Bike
Folding exercise bike such as a transmission box driven by pedals building a rotating bush at its output shaft drive a universal joint and drive a saddle supporter, thus permitting backward and forward motion with the saddle. Meanwhile, the universal joint drives connecting rods to tug a handle to show the handle inward and outward, thus making the bike have a multi-functional exercise effect. The main frame, handle supporter and saddle supporter may also be capable of
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