A golf club having a sensor that is removably connected at one or more positions of the golf club where the sensor comprises an inertial measurement unit including an accelerometer capable of measuring linear accelerations in three orthogonal axes and a gyroscope capable of measuring an angular rate of rotation around the same axes. The sensor may further comprise a processor which may perform instructions to detect the impact of the golf club with a golf ball and determine the start of the golf swing without any additional input from the user. The sensor may further have a power management system to extend the life of the power source.

A system for a virtual and mixed-reality enhanced exercise machine that allows a user to exercise while interacting with a virtual reality or mixed reality environment using whole body movements and positioning, and receiving haptic feedback associated with the user's interaction with the virtual reality or mixed reality environment.

Embodiments of the present disclosure help to synchronize multiple video segments of an actor or actors performing athletic maneuvers. Among other things, various embodiments help provide a side-by-side visual comparison of athletic maneuvers.

A force measurement system includes a force measurement assembly with a top surface configured to receive at least one portion of the body of a subject and at least one force transducer configured to sense forces and/or moments being applied to the top surface; at least one visual display device having an output screen configured to at least partially circumscribe three sides of a torso of the subject, and one or more data processing devices operatively coupled to the force measurement assembly and the at least one visual display device. In one or more embodiments, the force measurement assembly may be in the form of an instrumented treadmill. In one or more further embodiments, the force measurement system may additionally comprise a motion capture system configured to detect the motion of one or more body gestures of the subject.

A system and method for analyzing and improving the performance of a body motion of an animal or human subject requires instrumenting a subject with inertial sensors, monitoring a body motion of interest, converting sensor data into motion data and animation, comparing the motion data with existing data for motion related performance parameters, providing a real-time, information rich, animation and data display of the results in color coded displays; and based on the results prescribing a training regime with exercises selected from a library of standardized exercises using standardized tools and training aids.

A balance training device is provided. The balance training device may include a rail, a plurality of foot supports slidably coupled to the rail, and at least one balance pad connected to the rail to provide a degree of angular instability. The balance training device may include an adjustment mechanism associated with the rail and each foot support to selectively position each foot support in a desired position along the longitudinal length of the rail. The balance training device may include a base including an adjustable height dimension to provide increasing levels of balance difficulty.

A method includes: supporting a normal operation mode during which functionalities of a portable apparatus are available through an operating system of the apparatus, wherein the operating system includes a plurality of layers including a kernel and library functions-layer; supporting a limited operation mode during which the apparatus is configured to execute a physical activity algorithm based on physical activity data corresponding to a physical activity session performed by a user of the apparatus, wherein the physical activity algorithm applies a direct low-level hardware access bypassing at least the layers above the kernel and the library functions-layer; and switching between the normal operation mode and the limited operation mode

A variety of improvements to portable electronic devices are disclosed, particularly electronic devices designed for use in and around water. The improvements include a more secure interface jack, improved waterproofing techniques, improved battery stability, and improved device functionality. One or more of the disclosed improvements may be incorporated into a variety of portable electronic devices.

An exercise feedback system determines muscle stress measurements using physiological data generated by a sensor-equipped athletic garment. A muscle stress measurement represents an accumulated normalized signal from one or more of the sensors corresponding to a given muscle over a period of time. The exercise feedback system may customize exercise programs, determine risks of injury, or generate biofeedback for presentation on graphical user interfaces using the muscle stress measurements. In an embodiment, the exercise feedback system accesses pre-determined muscle stress measurement models that define criteria for the aforementioned features. For instance, responsive to determining that an athlete is becoming fatigued and exercising with improper form based on a muscle stress measurement, the exercise feedback system modifies the athlete's exercise program to help target and improve the athlete's weaknesses.

Described is a knob insert for application to the gripping end of a hockey stick. The knob insert comprises a rounded, oblique, cylindrical support structure, transitional shaft and tang aligned on a common longitudinal central axis. The support structure comprises a greater diameter rounded, cantle-like support and gripping structures.