The present application is directed to a method for use in a system implementing a reference golf club, one or more sensors associated with the reference golf club, and a computing device. The method comprises receiving from the one or more sensors, by the computing device, swing data relating to a swing of the reference golf club, analyzing, by the computing device, the swing data to determine recommended shaft parameter values for each of a plurality of shaft parameters using an algorithm, accessing, by the computing device, a shaft database comprising actual shaft parameter values for each of the plurality of shaft parameters for each of a plurality of shafts, determining, by the computing device, at least one shaft from the plurality of shafts based, at least in part, on a comparison between the recommended shaft parameter values and the actual shaft parameter values, transmitting, by the computing device, information relating to the at least one shaft; and displaying, by the computing device, the information on a display of the computing device.

A golf club incorporating an interchangeable shaft system includes a shaft, a shaft sleeve, a club head. The shaft sleeve is coupled to an end of the shaft and is received in a hosel included in the club head. The shaft sleeve is removably coupled to the club head. Hosel and shaft sleeve alignment features provide discrete orientations between the shaft and club head.

An adjustable sports paddle including a handle that extends to a neck portion and a substantially ovular frame. The frame supports first and second striking surfaces, which are sandwiched about an inflatable bladder. A conduit extends from the bladder to the handle through the neck, and the handle further includes a pressurizing mechanism for increasing an air pressure in the bladder via the conduit. In a preferred embodiment, the paddle can also include an adjustable handle having multiple lengths.

An adjustable sports paddle including a handle that extends to a neck portion and a substantially ovular frame. The frame supports first and second striking surfaces, which are sandwiched about an inflatable bladder. A conduit extends from the bladder to the handle through the neck, and the handle further includes a pressurizing mechanism for increasing an air pressure in the bladder via the conduit. In a preferred embodiment, the paddle can also include an adjustable handle having multiple lengths.

The hockey stick extender device was invented to address the problems of too short goalie sticks. A stick being “too short” means that the point where the stick broadens out is too low on the shaft. The extender is a cap with a hole or tunnel pierced therethrough. The shaft of the hockey stick is passed through the extender, and the extender is lowered on the shaft until it lies on the part of the stick where the stick widens. The effect of the extender is to raise the point where the goalie will grasp the stick higher on the shaft of the stick, or equivalently the combined stick and extender raises the point where the shaft of the combined stick and extender widens.

The hockey stick extender device was invented to address the problems of too short goalie sticks. A stick being “too short” means that the point where the stick broadens out is too low on the shaft. The extender is a cap with a hole or tunnel pierced therethrough. The shaft of the hockey stick is passed through the extender, and the extender is lowered on the shaft until it lies on the part of the stick where the stick widens. The effect of the extender is to raise the point where the goalie will grasp the stick higher on the shaft of the stick, or equivalently the combined stick and extender raises the point where the shaft of the combined stick and extender widens.

A golf club incorporating an interchangeable shaft system includes a shaft, a shaft sleeve assembly, and a club head. The shaft sleeve assembly is coupled to an end of the shaft and is received in a hosel included in the club head. The shaft sleeve assembly is removably coupled to the club head includes portions coupled by a flexible coupling.

Embodiments of a golf club head with a plurality of energy storage features are presented herein. In some embodiments, a golf club head comprises a body comprising a strike face, a heel region, a toe region opposite the heel region, a sole, a crown, a channel, a chamfer spanning between a strike face and the crown, and an internal radius transition feature from the strike face to at least one of the sole or the crown.

A golf club fitting apparatus and a method for fitting using the apparatus are provided. The golf club fitting apparatus may be attached to a golf club and provide fitting information including effective lie angle and effective loft angle. The golf club fitting apparatus includes a lower surface that contacts a butt end of a grip, an upper surface opposite the lower surface, and a side surface connecting the upper and lower surfaces. An angle indicator is disposed at a predetermined angle relative to a shaft axis of the golf club so as to rest in a neutral position when the golf club is in a normal address position.

A golf club fitting apparatus and a method for fitting using the apparatus are provided. The golf club fitting apparatus may be attached to a golf club and provide fitting information including effective lie angle and effective loft angle. The golf club fitting apparatus includes a lower surface that contacts a butt end of a grip, an upper surface opposite the lower surface, and a side surface connecting the upper and lower surfaces. An angle indicator is disposed at a predetermined angle relative to a shaft axis of the golf club so as to rest in a neutral position when the golf club is in a normal address position.