A clamping device for holding an object in place comprising a female plate 10 with an exterior 11 and interior 12 surface and a bottom edge 15 with a plurality protrusions 16 wherein each of the protrusions has a opening 17 therein; a male plate 1 with an exterior 2 and interior 3 surface and a bottom edge 9 with a plurality of teeth 7; and at least two stepper keys 21 on said exterior 2 surface of the male plate 1; wherein the male teeth 7 fit snuggly within the female plate protrusion openings 17 such that the object placed between the male plate 1 and the female plate 10 is held in place by locking the stepper keys 21 in place.

A reduced-gravity training ball that allows the user to more easily react to the ball's movement and accelerating skills than a regulation ball. A training system may be provided to coach the user through a series of drills and fitness exercises with the ball. The training ball may come in several weights that train the user by gradually using heavier balls that have more gravity. In one embodiment, a training ball has a lightweight inner bladder with an inflation port, and an exterior layer that covers the inner bladder. The exterior surface may be provided with lines, indentations, graphics and/or other features that improve the performance of the ball and/or that replicate some or all of the characteristics of the exterior surface of the regulation ball it simulates.

A system and method for pitching balls, particularly round balls such as volleyballs. The system and method are flexibly designed to simulate different types of pitches including but not limited to setting, blocking, bumping, shooting, dinking, passing, tipping, digging, serving, killing and spiking. A stable base frame is configured with an integrated operator stand. A rack bar is affixed to a front portion of the frame at an inclined angle. Three wheels are mounted on an adjustable throwing head, each wheel being powered by a motor that is adjusted independently so that the relative speed of the wheels imparts different spin to a ball that is launched from the throwing head. The throwing head can be adjusted up and down on the rack bar to be as high as a jump serve release point or as low as a at floor level to simulate a dig. The apparatus is portable and fits through standard gymnasium doors.

A volleyball practice assembly includes a target unit that may be mounted to a support thereby facilitating the target unit to have a ball launched toward the target unit. The target unit registers when the ball strikes the target unit thereby facilitating the target unit to aid in accuracy training with respect to the ball. A control circuit is coupled to the target unit and the control circuit detects when the ball strikes the target unit. A remote unit is provided. The remote unit is in communication with the target unit such that the remote unit controls operational parameters of the target unit.

Provided herein is a multi-purpose exercise apparatus for improving sports coordination with which a user may sense stimuli from inside and outside one's body and at the same time operate one's body functions so as to adapt to the given circumstances using body muscles when playing a football, volleyball, handball, tennis, table tennis game and the like, thereby improving abilities of adjusting one's body parts such as the user's correct posture, balance, timing, flexibility, agility and the like, especially, significantly improving the ball control technique, body senses, and judgment ability of ball game players or sports participants.

A net boundary indicator can comprise a strap comprising an inside surface and an outside surface opposite the inside surface. A reinforcing member can comprise a top end and a bottom end, the reinforcing member being attached along a length of the inside surface of the strap. A top clip can be coupled to the strap adjacent the top end of the reinforcing member. A bottom clip can be coupled to the strap adjacent the bottom end of the reinforcing member. A first sleeve can be attached along a length of a surface of the strap. An aligning device can be coupled to the surface of the strap below the first sleeve and in-line with the first sleeve, and a bubble level can be coupled to the strap.

A volleyball training device has a training state and a using state, including a base, a volleyball net component, and an interception net component. The volleyball net component and the interception net component are detachably connected to the base. In the using state, the volleyball net component is connected to the base, and the interception net component is detached from the base. In the training state, the volleyball net component is connected to the base, and the interception net component is connected to the base. Through the structure above, when in the training state, the interception net component can intercept the volleyball that passes an upper end of the volleyball net component, facilitating a user's practice of volleyball actions such as serving and spiking. When in the using state, only the volleyball net component is connected to the base, and the user can normally hit the volleyball.

This disclosure is related to a training ball designed to facilitate practice and improvement of sporting skills, and methods for training with the ball. In some embodiments, the ball may be a training volleyball designed for improving volleyball skills. The ball may comprise a spherical surface and at least one marking on the spherical surface associated with at least one training drill. The one or more markings may include a variety of colors, patterns, and textures, and may be associated with a number of training drills. The markings may be color-coded to different training drills for ease of use. The markings may direct a player on proper hand placement and striking zones used in a variety of plays.

An exercise balance board may have at least a platform for a user supported by a resilient, air-filled partial sphere. It contains features which allow users of any size or fitness level to properly exercise muscle groups. The balance board allows a user to exercise upper and lower muscle extremity groups either individually or simultaneously.

An automatic volleyball feeder system for setting a volleyball in the air to a player includes a volleyball launcher and a basket assembly. The volleyball launcher comprises an actuator assembly in cooperating engagement with the basket assembly to activate the actuator when a volleyball is received by the basket assembly. The launcher sends the volleyball along a consistent trajectory. The launcher is configurable to modify the height and angle of the trajectory.