Abstract: A limiting structure for a body-training device includes a base, a positioning shaft, and a controlling member. The base comprises a slidable sleeve and the base is fixed on the foundation. The slidable sleeve has a shaft hole. The pivot holder of the body-training device has a positioning portion aiming at the shaft hole. The positioning shaft passes through the shaft hole. When a frame of the body-training device is standing, the positioning shaft can be slid to connect to the positioning portion so as to limit the pivot holder not to swing laterally. The controlling member is assembled on the frame and combined with the positioning shaft to control the positioning shaft to be slid to connect to the positioning portion or to be slid to detach from the positioning portion.

Abstract: An extension base for an exercise apparatus includes a stationary seat that is attached to a bottom of a frame of the exercise apparatus and defines therein a channel; and two extension legs that are inserted into the channel of the stationary seat from two openings at two ends of the stationary seat, so that the extension legs can be extended or retracted with respect to the stationary seat. When the extension legs are fully retracted into the stationary seat, a distance between the outer ends of the two extension legs farthest away from each other is still long enough to support the elliptical exerciser and prevent it from falling. The extension base solves the problem that the conventional exercise apparatus tends to rollover when its base is removed.

Abstract: A spinning bike with swingable structure includes a frame, a base member, and a limiting assembly. A mount of the limiting assembly is disposed on the frame, and two supporting bars of the limiting assembly are disposed at two sides of the mount and standing vertically. An adjustable member is adapted to adjust the two supporting bars to move downwardly until bottom ends of the supporting bars are in contact with the base member, so that the frame is not swingable with respect to the base member. Alternatively, the adjustable member adjusts the two supporting bars to move upwardly until the bottom ends are not in contact with the base member, so that the frame is swingable with respect to the base member.

Abstract: A switchably swingable spinning bike includes a bike body and a base. The base has a pivot portion and is pivotally connected to a swinging seat of a swinging device. The swinging seat has two buffers flanking the pivot portion. The swinging seat has a switching device that includes two undeformable propping members that flank the pivot portion. Each of the propping members is slidable with respect to the swinging seat until it props between the swinging seat and the base, thereby limiting the swinging seat's pivotal swing with respect to the base, and in turn switching the bike body from a swingable state to a non-swingable state.