Abstract: An exercising bicycle is proposed, having a rear hub thereof being mounted with a spring seat, a coupling member, a spiral spring, a turning mechanism and a braking system. The spring seat is formed with a shaft for being sleeved with the coupling member. The spiral spring is placed between the coupling member and spring seat. The turning mechanism is operatably driven by body motion of a user, whereby the coupling member is urged to rotate with respect to the spring seat for twisting the spiral spring tight, and the spring seat is actuated to rotate by resilient force from releasing the twisted spiral spring. By this mode of operation as to urge the turning mechanism for making the spiral spring store kinetic energy, and then to release the stored energy for driving the bicycle to move, the user can be elicited with a large amount of whole body exercise.

Abstract: An exercising bicycle is proposed, having a rear hub thereof being mounted with a spring seat, a coupling member, a spiral spring, a turning mechanism and a braking system. The spring seat is formed with a shaft for being sleeved with the coupling member. The spiral spring is placed between the coupling member and spring seat. The turning mechanism is operatably driven by body motion of a user, whereby the coupling member is urged to rotate with respect to the spring seat for twisting the spiral spring tight, and the spring seat is actuated to rotate by resilient force from releasing the twisted spiral spring. By this mode of operation as to urge the turning mechanism for making the spiral spring store kinetic energy, and then to release the stored energy for driving the bicycle to move, the user can be elicited with a large amount of whole body exercise.