A shaft 6 includes a plurality of layers formed by fiber reinforced resins. The layers include a hoop layer and bias layers. The hoop layer includes a full length hoop layer s9 constituted with a prepreg having a fiber elastic modulus of equal to or greater than 30 (tf/mm.sup.2) and having a fiber weight per unit area of equal to or greater than 50 (g/m.sup.2) but equal to or less than 80 (g/m.sup.2). The bias layers s2, s3, s4, and s5 include high elasticity containing bias layers s4 and s5 constituted with a prepreg contacting a high elastic pitch-based carbon fiber having a fiber elastic modulus of equal to or greater than 80 (tf/mm.sup.2). Preferably, the full length hoop layer s9 is disposed outside the high elasticity containing bias layers s4 and s5.

Gymnastics gear for performance of gymnastic exercises, where the gymnastics gear comprises at least a twisting belt, where the twisting belt comprises a first ring, typically an outer ring, and a second ring, typically an inner ring, where the two said rings are concentrically joined and can rotate in regard to each other about a common axis, where the first ring furthermore comprises at least two connection devices, where said connection devices are preferably arranged symmetrically at the outer periphery of the first ring and adapted for joining to a high-tensile or elastic rope, where the second ring also comprises connection devices at the periphery, where these connection devices are adapted for direct or indirect mounting of connection elements to a somersault belt, where the somersault belt is an inflatable somersault belt comprising at least one chamber and at least one valve, which achieves both a good centering of the somersault belt and a good tightening to the body of the gymnast, and where one and the same somersault belt can be adapted to gymnasts of different size as optimally as possible.

Disclosed herein are various forms of hybrid baseball bats comprising a wood shell having a radial wall and an outer radial surface profile defining a baseball bat. The wood shell having a central core with a central surface thereon extending from a distal end of the bat. The central surface being profiled with a taper that in some embodiments extends entirely through to the proximal end. A fibrous construct is housed in the central core and infiltrated with an epoxy resin. In some forms, the fibrous construct is in the form of a sleeve. Disclosed are various manufacturing techniques for manufacturing hybrid baseball bats including a low pressure bladder method, a high pressure bladder method, and a centrifugal force method.

A golf club and golf club head having a high static loft angle, low forward center of gravity, and enhanced z-axis gear effect via a large roll radius and/or tightly controlled moment of inertia about the CG x-axis, Ixx, associated with upward and downward twisting of the club head.

Disclosed is a technical training garment configured for use with modular, interchangeable biomechanics units and or resistance modules. The garment may provide resistance to movement throughout an angular range of motion and or tracks a variety of biomechanical parameters such as stride length, stride rate, angular velocity and power expended by the wearer. The garment may be low profile, and worn by a wearer as a primary garment or beneath or over conventional clothing or athletic uniform. The device may be worn as a supplemental training and or diagnostic tool during conventional training protocols, or as a biomechanics or biometric data capture device during competition.

The invention relates to a club head (1) for a golf club, comprising an impact plate (4) for teeing off a golf ball. The club head also comprises a shell (2) produced from a first material, on which the impact plate (4) is attached, a core (3) at least partially surrounded by the shell (2) and produced from a second material, and at least one weighting element (6; 6a, 6b) produced from a third material. The second material of the core (3) has a lower density than the first material of the shell (2). The third material of the weighting element (6; 6a, 6b) has a higher density than the first material of the shell (2) and/or than the second material of the core (3). Preferably, at least one sensor unit (5) is also provided, which is arranged at least partially inside the core (3).

A golf club comprises a shaft, a club head, and a connection assembly that allows the shaft to be easily disconnected from the club head. In particular embodiments, the connection assembly includes a removable hosel sleeve that allows a shaft to be supported a desired predetermined orientation relative to the club head. In this manner, the shaft loft and/or lie angle of the club can be adjusted without resorting to traditional bending of the shaft. In another embodiment, the club head has an adjustable sole that can be adjusted upwardly and downwardly relative to the strike face of the club head, which is effective to adjust the face angle of the club head.

A training device for the human or animal body includes a balance body with a movable centre of mass and a holder with which the balance body can be carried. The holder includes a harness with connectors for connecting to a torso of the body and with a cavity in which the balance body is at least partially received and fixed. The harness particularly includes a first part with connector for attaching to a back of the user and a second part connected releasably to the first part. The first part and the second part adjoin each other so as to form a cavity which is open on both sides and in which the balance part is at least partially received in substantially fitting manner.

A golf club head includes a striking face, a crown and a sole. The crown and/or the sole includes an FRP member formed by a fiber reinforced plastic that contains a fiber and a matrix resin. The FRP member has an average flexural modulus of greater than or equal to 25 GPa. The fiber may contain a carbon fiber. The carbon fiber may have a tensile elastic modulus of greater than or equal to 300 GPa. The fiber may contain a metallic fiber. The FRP member may have a resin content of less than or equal to 40% by weight. The matrix resin may have a glass transition temperature of higher than or equal to 150° C.

A tennis racket includes throats. Each throat includes a fiber reinforced layer and a vibration damper. The vibration damper is surrounded by the fiber reinforced layer. The fiber reinforced layer includes a plurality of reinforcement fibers and a matrix. The reinforcement fibers are typically carbon fibers. The material of the matrix is a resin composition whose base material is an epoxy resin. The vibration damper is formed of a polymer composition. The polymer composition contains a base polymer. The base polymer is preferably a styrene-isoprene-styrene block copolymer or an acrylic elastomer.