A golf club head comprising a body and a hollow stiffening structure is disclosed herein. The body comprises a face section, a sole section, and a crown section, and defines a hollow interior. The hollow stiffening structure extends within the hollow interior from the crown section to the sole section to reduce stresses placed on the face section during impact with a golf ball. The hollow stiffening structure creates stiffness in a vertical, crown-sole direction of the body, while reducing stiffness in the horizontal, front-rear direction. These two effects combine to increase ball speed and improve other performance metrics from low center through high center ball impact locations, and simultaneously lower CT of the golf club.

A spherical hand exerciser has a resilient, non-slip exterior with an off-center cavity and a weighted core housed within the cavity. A method of performing physical therapy with the exerciser includes grasping at least one exerciser; and manipulating it around the hand and fingers. The offset placement of the weighted core works stabilizer muscles of the fingers, hand, wrist, and forearm during manipulation, increasing the synergy and workable range of motion of both the flexor and the extensor muscles, allowing for faster learning and better effects.

A shim or badge is affixed to a golf club body to produce a cap-back iron, giving the appearance of a hollow-body iron. In this way, the golf club can be manufactured with the performance benefits of a game improvement iron, while providing the appearance of a blade, player's iron, and/or a hollow-body iron. For example, by using a lightweight and rigid shim or badge to close a cavity opening and extend into the toe portion in the golf club body, the golf club head can provide increased stiffness in the topline, while lowering CG. Various shim or badge arrangements and materials can be used, and a filler material and/or damper can be included within the cavity to improve sound and feel, while minimizing loss in COR.

A protective rowing device for compression of the abdomen is provided that comprises a brace and U-shaped support member that may connect to a rowing machine seat and rail.

A freestanding structural display apparatus for sport goalpost includes a freestanding media structure, a main computing device, and a sporting game-scoring structure. The freestanding media structure includes a frame, a control room, a hospitality suite, a plurality of display panels, a lower display ring, and a plurality of output panels. The frame is fully enclosed by the plurality of display panel and the plurality of output panels. The lower display ring is laterally connected around the frame at the ground level. The control room and hospitality suite are internally connected to the frame as the main computing device is positioned within the control room. The sporting game-scoring structure is connected to the frame and positioned atop a top panel of the plurality of display panels. The lower display ring, the plurality of output panels, and the game-scoring structure are electrically connected to the main computing device thus allowing multiple game-plays.

A golf club head comprising a body and a hollow stiffening structure is disclosed herein. The body comprises a face section, a sole section, and a crown section, and defines a hollow interior. The hollow stiffening structure extends within the hollow interior from the crown section to the sole section to reduce stresses placed on the face section during impact with a golf ball. The hollow stiffening structure creates stiffness in a vertical, crown-sole direction of the body, while reducing stiffness in the horizontal, front-rear direction, and is filled with a weighted dampening insert that extends the entirety of the length of the stiffening structure and blocks entry into the stiffening structure.

A plank support exercise apparatus and related methods is provided. The plank support exercise apparatus has an arm support pad and a hand grip for facilitating a user's achievement of a plank exercise. The apparatus includes an ground-interface surface.

A method of joining dissimilar metal, golf club components, and particularly golf club bodies, hosels, and faces, using a projection resistance welding process is disclosed herein. The method may include the step of applying an interlayer material before the projection resistance weld process occurs.

A weight plate securing strap having a stretchable strip with a first end, a second opposite end, a first side, a post on the first end, and a plurality of apertures near the second opposite end. A first gripping flap is positioned at the first end and a second gripping flap is positioned at the second opposite end. The gripping flaps are also positioned on the first side. The gripping flaps are constructed so that fingers and thumbs of a user remain on the first side of the strip as the user grips the gripping flaps, stretches the strip around the barbell, and inserts the post into the aperture. The use of the gripping flaps thereby prevents the fingers and thumbs of the user from interfering with the insertion of the post through the aperture. The strip wound and stretched around the barbell creates high resistance to movement of the strip along the length of the barbell. The strip can be made in one piece and entirely of rubber.

A treadmill may include two separate left and right belts rotating around two sets of rollers, four legs having an adjustable height via air suspension to customize an inclination of the treadmill, a thermoelectric assembly, a fragrance assembly having a rotating fragrance cartridge to emit various smells toward a user of the treadmill, a display on which exercise programs are played, and an attachment module having a dispensing tray on which treats are dispensed. A handle of the treadmill may have a sensor to sense a height and front-rear position, and a belt divider provided between the left and right belts may have position or proximity sensors to sense a left-right position. An inclination of the treadmill may be automatically adjusted according to positions detected by the sensors, and the fragrance assembly, attachment module, and inclination may be automatically operated in accordance with an exercise program played on the display.