Abstract: A ball chair with a retaining device has a seat (10), a spherical cushion (20) and two retaining pieces. The spherical cushion (20) rests on the seat (10). The two retaining pieces are selective retaining rods or retaining walls and are respectively attached to a rear end and a front end of the seat (10). Thus, the spherical cushion (20) is held between the two retaining pieces and firmly secured on the seat (10) to keep the spherical cushion (20) from falling off the ball chair.

Abstract: A ball chair with a securing device has a seat (10), a ball-shaped cushion (20) and a guard rod (30). The ball-shaped cushion (20) rests on the seat (10). The seat (10) has a backrest (13) attached to a rear end of the seat (10), and the guard rod (30) is erected at a front end of the seat (10). Thus, the ball-shaped cushion (20) is firmly secured on the seat (10) to avoid danger of a user falling when sitting on the ball chair.

Abstract: A handle assembly includes a ring-shaped body which has three tapered passages defined radially therethrough, each passages having a large diameter opening defined in the inside of the handle and a smaller diameter opening defined in the outside of the handle. A resilient rope extends through at least one of the tapered passages. A locking device has a teardrop member and a shank extending from the teardrop member. The shank has a collar connected thereto, and the collar has a clamping member movably engaged therewith. The resilient rope in the tapered passage is securely held by the teardrop member. The resilient rope extends through the collar and is engaged by the clamping member.

Abstract: A grip exercise device includes a grip body having a C-shaped head containing an opening transversely defined therein, two handles each extending from each of the two distal ends of the head, a plurality of elongated retaining ribs radially extending inward from the inner wall of the opening, a plurality of receiving recesses defined between two adjacent retaining ribs, and a cylindrical adjusting member detachably received in the opening and having a plurality of axial blades each detachably secured in one of the corresponding receiving recesses.

Abstract: A handle structure for a chest pull includes a substantially ring-shaped handle having a tapered passage defined radially therethrough. A positioning device including a sphere member is sized to be movably retained in the tapered passage. A shank extends from the sphere member and is connected to a collar member which has an aperture defined therethrough. A positioning member has a head movably retained in the collar member and a tail extending transversely from a mediate point of the head. The tail is positioned corresponding to the collar member so as to position a resilient member between the head and the collar member.