A foot and/or leg support device for a chair. The chair includes a central post having a base, a seat supported by the central post and having a front seat edge, and a plurality of support legs which branch from the base of the central post. The support device includes a clamp for attachment to the central post of the chair, mountable to different diameters of the central post, a cantilever arm which extends from the clamp, and a support frame located at a distal end of the cantilever arm for supporting a foot and/or leg of a user, the cantilever arm being a length wherein at least part of the support frame extends past a vertical plane of the front seat edge of the chair. In an example, the support frame can be installed onto the central post without disassembling the chair.

The fastening structure includes an inner sleeve, a quick-release handle and an outer sleeve. The inner sleeve has an outer threaded conic surface, a through slot, shrinkable slots and claw plates between adjacent two of the shrinkable slots. The quick-release handle is provided at a bottom end of the inner sleeve for controlling a width of the through slot. The outer sleeve is used for connecting the footrest ring and has an inner threaded conic surface to screw the outer sleeve onto the inner sleeve.

The invention provides an adjustable footrest ring for a chair with a central post. The invention includes an inner sleeve, a quick-release handle, a support frame and a ring. The inner sleeve is used for being put around the central post and has an outer threaded surface, a through slot and a pair of passing holes below the outer threaded surface. The quick-release handle is formed with a through hole at an end thereof. The through hole corresponds to the passing holes for being passed through by a bolt. The inner sleeve is shrunken when the bolt is tightened and the quick-release handle is closed. The support frame has an outer sleeve and support rods radially extending therefrom. An inner threaded surface is formed inside the outer sleeve so as to screw the outer sleeve onto the inner sleeve. The ring is connected to outer ends of the support rods.

The invention provides an adjustable footrest ring for a chair with a central post. The invention includes an inner sleeve, a quick-release handle, a support frame and a ring. The inner sleeve is used for being put around the central post and has an outer threaded surface, a through slot and a pair of passing holes below the outer threaded surface. The quick-release handle is formed with a through hole at an end thereof. The through hole corresponds to the passing holes for being passed through by a bolt. The inner sleeve is shrunken when the bolt is tightened and the quick-release handle is closed. The support frame has an outer sleeve and support rods radially extending therefrom. An inner threaded surface is formed inside the outer sleeve so as to screw the outer sleeve onto the inner sleeve. The ring is connected to outer ends of the support rods.

A safe and secure intercourse-facilitating adjustable bench device. The bench device is configured with a frame having vertical legs, U-shaped rails, an adjustable bench, footrests and wrist straps. The adjustable bench device can be adjusted both in height and inclination to perform sexual intercourse in a variety of positions. The bench device can be adjusted and locked in an inclined, flat or declined position. The height of the frame can also be adjusted and can be used for performing vaginal, anal and oral sex, even by obese users or users with injuries, illnesses or limited physical movement.

A vertical pulldown machine includes: a support frame seated on a floor surface; a body frame connected to the support frame to form a support structure; a pair of weight units rotatably mounted on the body frame and mounted with a weight plate; a pair of rotating units rotatably mounted on the body frame and provided to rotate respectively at a preset distance apart; a pair of connection units provided to connect the weight unit and the rotating unit to transfer a load of the weight plate to the rotating unit and to enable length adjustment; a pair of grip units connected to one end of each of the pair of rotating units and providing a space for a user to grip; and a sitting unit connected to the support frame and disposed in front of the body frame to provide a seat unit for the user to sit.