A striking subassembly has lower and upper components. The lower component has a hemispherical lower section and a cylindrical upper section. A chamber within the lower component terminates above with an annular projection. The upper component has upper and lower disks. An annular recess is between the upper and lower disks offset from the annular projection. Feathers extend upwardly from the upper disk. An electrical assembly has a printed circuit board with a periphery. The periphery is secured within the chamber to the upper component. A light emitting diode extends downwardly from the printed circuit board. A battery powers the light emitting diode.

A system and methods of fitting golf clubs, and more particularly, the systems and methods related to wedge type golf clubs, having multiple sole configurations and/or bounce angles. More specifically, the present invention is directed to system and methods that enable a player to quantify the performance of the golf club's sole interaction with the ground and to determine the sole configuration and bounce angle that provides the most optimal shot performance.

Systems and techniques for the collection and display of athletic information. Athletic data relating to a single person or group of people is collected at a central location, and subsequently displayed at a desired remote location so that the person or people can review and critique their performance. In addition, athletic data for multiple persons can be collected at a central location, and subsequently displayed to a user at a desired remote location, so that the user can compare his or her athletic activities to others.

Embodiments of the invention relate to throwable toys such as shuttles and balls. In some of the illustrative embodiments a shuttle includes means to determine information relating to the throw or state of motion of the shuttle, and means to convey an audio information signal to a user during the throw.

An Internet of Thing (IoT) device includes a transceiver coupled to a processor. Blockchain smart contracts can be used with the device to facilitate secure operation.

Systems and methods are described for providing coaching, training, or equipment specification information to individual golfers based on data generated during their individual golf swings. Additionally, data hubs are described that provide information and services to individuals based on data collected for a community of multiple golfers. Such community data hub systems and methods may provide one or more of the following: (a) storage of scoring data, swing data, ball flight data, and/or equipment data for multiple golfers; (b) at least some level of individual access to the stored data for the community; and/or (c) electronic interaction between golfers within the community.

Wearable electronic devices that are designed to be worn on the head of a user while the user is swimming can determine swimming strokes and swimming performances of the user accurately using motion sensors. Using a sound speaker, the wearable electronic device can play music and provide audio feedback to the swimmer. By comparing the swimming performance of the swimmer wearing the device with previously recorded swimming data, the wearable electronic device can provide audio comparison results to the swimmer while the swimmer is swimming in water. The wearable electronic device can also support similar functions for other sports and physical activities.

A system includes a minimally intrusive display system (MIDS) configured to be disposed on an eyewear. The MIDS includes a display system and a sensor system configured to provide for a sensor data. The MIDS further includes a processor configured to process the sensor data to derive an activity metric. The processor is further configured to display, via the display system, the activity metric, wherein the display system is disposed in the eyewear so that the activity metric is only viewed when a user of the eyewear turns the user's pupil towards the display system at angle from a forward direction.

A method for automatic recognition of a predetermined move of a user includes the construction of several characteristic physical quantities of the move of the user from acquired measurements performed by a tri-axial accelerometer only within a time interval [t.sub.d; t.sub.i], where the instant t.sub.i is an instant, later than the instant t.sub.d, at which the measured acceleration of a fist of the user in a direction X.sub.m changes sign and becomes negative, the direction X.sub.m being the direction parallel to a forearm of the user, directed from the elbow of the user to the fist of the user, then the classification of the move of the user in a predefined move category, chosen from among several possible predefined categories of moves, from these constructed characteristic physical quantities.

A wearable device such as a garment is disclosed, having at least one sensor, for sensing a parameter. Electronics are provided for processing the sensed parameter, and for providing feedback. Feedback may be in the form of proprioceptive tactile or audible feedback, or in the form of an adjustment of a performance parameter of the wearable device. In one implementation, the processor is configured to activate an effector to provide feedback to the wearer to make a body position correction to bring the position into alignment with predetermined body position reference data.