A golf club training device including: a body having a first end configured to be gripped by a user and a second end longitudinally extended from the first end; and a swing speed sensor disposed at the second end for producing an output signal for determining a portion of a golf swing having a greatest swing speed. A golf club training system is also provided to include: a plurality of the golf club training devices wherein at least two of each of the plurality of golf club training devices having one or more of a different weight and length.

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 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.

Embodiments of a system for measuring and displaying a color code representing a lie angle value corresponding to suitably calibrated club heads are described herein.

A system for providing golf swing information including a body, a force sensor, and a controller. The body can include a bottom portion configured to rest on a ground surface and can include a top portion. The force sensor can be connected to the top portion of the body. The force sensor can be engageable with a foot of a user performing a golf swing. The force sensor can be configured to generate a force signal based on a force generated by the foot of the user during the golf swing. The control module comprising can include a housing and a speaker connected to the housing and configured to generate an audible indication. The controller can be connected to the housing and can be in communication with the force sensor. The controller can be configured to operate the speaker to generate the audible indication based on the force signal.

A golf training aid includes one or more of a movable sound element assembly, an adjustable grip assembly, and a club head assembly. The movable sound element assembly includes a movable sound element that is coupled to a shaft of the club. The movable sound element can be positioned on the club shaft so as to be selectively retained by the movable sound element assembly and can be configured to release from the movable sound element assembly when the club is swung by the user and as a function of the swing speed thereof. The adjustable grip assembly is axially and rotationally movable so as to dispose the assembly in a plurality of different grip positions.

A recreational assistant device including a frame as well as a navigation system module. The recreational assistant device additionally incudes a microphone, an output system, and at least one processor each connected to the frame. The microphone is configured to receive an aural command as input from a user requesting a distance between the portable assistance device and an other specified location. The output system is configured to convey information to the user. The at least one processor is connected to the frame and is in operable communication with the at the navigation system module, the microphone, and the output system. The at least one processor is configured to, in response to the detection of the aural command by the microphone or other input, cause the output system to convey the distance between the portable assistance device and the other specified location to the user.

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 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 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.