Abstract: Disclosed is a horizontal exerciser bike which mainly consists of a main support, a counter, a pair of linkages, and other related components. The main support is so designed that it horizontally extends along a longitudinal axis thereof and therefore has a low center of gravity. The linkages are separately disposed at two sides of the main support and each comprises a foot pedal post pivotally connected to a front end of the main support, an n-shaped bracket fixedly attached to a lower portion of the foot pedal post, a link pivotally connected at a front end to the n-shaped bracket and at a rear end to an inverted T-shaped coupler pivotally attached to one side of the main support, a cylinder pivotally connected at a front extension end to the inverted T-shaped coupler and fixedly connected at a rear end to a fixed pin disposed near a rear end of the main support, and a grip post adjustably connected to a middle portion of the inverted T-shaped coupler.