A system that measures a swing of a bat with one or more sensors and analyzes sensor data to create swing quality metrics. Metrics may include for example rotational acceleration, on-plane efficiency, and body-bat connection. Rotational acceleration measures the centripetal acceleration of the bat along the bat's longitudinal axis at a point early in the rotational part of the swing; it is an indicator of the swing's power. On-plane efficiency measures how much of the bat's angular velocity occurs around the swing plane, the plane spanned by the bat and the bat's sweet spot velocity at impact. Body-bat connection measures the angle between the bat and the body tilt axis, which is estimated from the trajectory of the hand position on the bat through the swing; an ideal bat-body connection is near 90 degrees. These three swing quality metrics provide a simple and useful characterization of the swing mechanics.

A system for providing recreational assistance includes a frame and a speaker and at least one processor connected to the frame. The at least one processor is in operable communication the speaker and a user input device and configured to, in response to the detection of user input by the user input device, generate a signal representative of a distance between the frame and a landmark and cause the speaker to generate an aural indication representative of the distance.

A golf club head comprises a sole, a recessed sole port in the sole; and a rotatably adjustable sole piece adapted to be at least partially received within the sole port and comprising a central body having a plurality of contact surfaces adapted to contact the sole port and being offset from each other along a central axis extending through the central body of the sole piece. The sole piece can be positioned at least partially within the sole port at five or more rotational and axial positions with respect to the central axis, wherein at each rotational position, at least one of said contact surfaces of the central body contacts the sole port to set the axial position of the sole piece. The sole port and/or the sole piece can be generally pentagonal in shape.

A system for providing recreational assistance includes a frame and a speaker and at least one processor connected to the frame. The at least one processor is in operable communication the speaker and a user input device and configured to, in response to the detection of user input by the user input device, generate a signal representative of a distance between the frame and a landmark and cause the speaker to generate an aural indication representative of the distance.

Disclosed herein is an educational golf club comprising a shaft and a head, wherein the shaft has a weight increasing means disposed therein. The educational golf club according to the present invention is in a wide use since being adjusted in weight or length according to the user's height or age. Additionally, the educational golf club according to the present invention generates a hitting sound from the shaft realistically when the user hits the golf ball to arouse interest in golf.

A Swing Trainer provides a transverse slide mechanism that generates an audible and/or haptic click in response to a smoothness of a swing of a sports-related implement. In other words, the Swing Trainer clicks in a way that a user can either or both hear and/or feel during a swing of the sports-related implement. Such sports-related implements include, but are not limited to, golf clubs, tennis racquets, hockey sticks, baseball bats, lacrosse sticks, cricket bats, or any other sports-related implement wherein smoothness of a user swing is desirable. The Swing Trainer rotatably couples a proximal end to a distal end of the sports-related implement. Further, the Swing Trainer generates the audible and/or haptic click when a sliding force imparted to the Swing Trainer by the swing exceeds a static holding force of the transverse slide mechanism. Typically, the sliding force exceeds the static holding force during an improper user swing.

A system that measures a swing of a bat with one or more sensors and analyzes sensor data to create swing quality metrics. Metrics may include for example rotational acceleration, on-plane efficiency, and body-bat connection. Rotational acceleration measures the centripetal acceleration of the bat along the bat's longitudinal axis at a point early in the rotational part of the swing; it is an indicator of the swing's power. On-plane efficiency measures how much of the bat's angular velocity occurs around the swing plane, the plane spanned by the bat and the bat's sweet spot velocity at impact. Body-bat connection measures the angle between the bat and the body tilt axis, which is estimated from the trajectory of the hand position on the bat through the swing; an ideal bat-body connection is near 90 degrees. These three swing quality metrics provide a simple and useful characterization of the swing mechanics.

A method for analyzing sensor data from baseball swings (or swings in similar sports) that transforms data into a reference frame defined by the bat orientation and velocity at impact. The trajectory of the sweet spot of the bat is tracked through the swing, and is analyzed to generate metrics describing the swing. A two-lever model of the swing may be used to model the effects of body rotation and wrist rotation. Data may be analyzed to identify relevant events during the swing such as start of downswing, commit (wrist release), on-plane, peak bat speed, and impact. Illustrative swing metrics derived from the sweet spot trajectory, the swing plane reference frame, and the two-lever model include: forward bat speed, on-plane rotation, hinge angle at commit, hinge angle at impact, body rotation ratio, body tilt angle, and swing plane tilt angle.

A signaling device, and in particular a signaling device for a striking implement such as a tennis racket, a golf club or the like, for generating signals during a movement of the signaling device (10), including a resonant body and a holding device, wherein the resonant body and the holding device are to be connected to one another or connectable to one another, so as to attach the resonant body by way of the holding device to a striking implement or the like, wherein the resonant body furthermore includes a cavity for generating an acoustic signal during a movement, wherein the resonant body has a single opening which has a fluidic operative connection to the cavity and by way of which the cavity is fluidically connected to the surrounding area.

A sports swing training device is attachable to a sports striking-object, such as a golf club, tennis racket, or baseball bat, and uses multiple motion sensors, including accelerometers, gyroscopes and magnetometers, in conjunction with one or more microprocessors and device displays, to measure and display various swing metrics and to project flight patterns resulting from each swing. Swing data are displayed in graphic and/or indicia format, on the device's displays and are wirelessly transmitted to the displays of one or more external devices, such as smart phones or tablet computers. The projected flight patterns reveal flaws in the swing so as to promote corrective adjustments by the athlete.