A resistance swim training device is described. The resistance swim training device includes a waist harness configured to secure around a waist of a swimmer. The resistance swim training device also includes a spacing bar configured to facilitate moving and rotation motions of the swimmer. The resistance swim training device further includes two or more cords that connect the spacing bar and the waist harness.

A swimming goggles storage assembly for storing and drying swimming goggles includes a canister that has a plurality of drain holes therein to drain a fluid from the canister. A lid is removably positioned on the canister to close the canister. The lid has a plurality of drain apertures therein to pass the fluid therethrough when the lid is positioned on the canister. A pair of swimming goggles is provided and the swimming goggles are inserted into the canister after the swimming goggles are worn in water for storage. The drain holes in the canister and the drain apertures in the lid facilitate the swimming goggles to dry in the canister.

Methods for providing swimmers with performance metrics, turn detection, and stroke rate detection are disclosed. An example method comprises mounting a wearable device comprising an accelerometer, gyroscope and processor on a swimmer's head, continuously measuring acceleration using said accelerometer and angular velocity using said gyroscope to provide acceleration and angular velocity signals to said processor, processing said acceleration and angular velocity signals to determine first roll and pitch angles, applying a correction to axes of said gyroscope based on said roll and pitch angles to determine corrected angular velocity signals, initializing a heading angle at a pre-defined, non-zero value, integrating said corrected angular velocity signals over a time window to determine changes to the heading angle, determining maximum and minimum heading angles within the time window, and, recording a turn when a difference between the maximum and minimum heading angles within the time window is at least approximately 180 degrees.

Described herein are methods for determining a target musculoskeletal activity cycle (MSKC) to cardiac cycle (CC) timing relationship. The method may include detecting a signal responsive to a cyclically-varying arterial blood flow at a location on a head of a user; providing a recurrent prompt at a frequency of the heart pump cycle using the signal, such that the signal correlates with a magnitude of blood flow adjacent to the location, and the recurrent prompt is provided to guide the user to time performance of a component of a rhythmic musculoskeletal activity with the recurrent prompt; and guiding the user to adjust a timing of the component of the rhythmic musculoskeletal activity to substantially maximize a magnitude of the signal. In some embodiments, the method further includes generating the recurrent prompt by amplifying the sound generated by the blood flow in or in proximity to an ear of the user.

An apparatus to quickly position a start assist device for backstroke swimmers and remove said start assist device once the apparatus detects or is signaled that the swimmer has left to prevent injuries and obstructions caused by the start assist device. A mechanical embodiment of such an apparatus and a motorized embodiment of such an apparatus with a data input system to position the start assist device according to the individual swimmers needs and means to signal the start event are disclosed.

In one aspect, a swimjet system may include a reverse thrust system worn by a swimmer proximate the frontal upper torso. The system provides a variable amount of reverse thrust such that the user can swim-in-place or make gradual forward progress. Importantly, this may enable a user to effectively extend a small residential pool to serve the same function as a twenty-five meter pool typically found at commercial or government facilities. The system also provides laminar current under the user while swimming, which solves the problems of leg drop, the need to out-kick the arm stroke, and turbulence and wave action around the head associated with conventional swim-in-place devices. Still further, in certain embodiments the system provides a relatively strong current in the region of the arm stroke moving away from the swimmer which provides enhanced resistance for proficient swimmers.

Apparatus and methods for measuring force exerted by an object moving in a fluid or force of a moving fluid on a stationary object. Embodiments may be configured to measure power exerted by an object moving in a fluid. At least one sensor disposed on the object outputs at least one sensor signal corresponding to a pressure differential between first and second surfaces of the object. Data derived from one or more sensor signals may be processed according to a model to output a measure of the force and/or power of the object moving in the fluid or the force of the moving fluid on the stationary object, as a function of time. Embodiments may be configured for applications such as providing feedback for control of actuators in electromechanical systems for liquid or gaseous media, and providing performance metrics during water sports, such as swimming and paddling.

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. To improve water resistance, magnetic switches are utilized as selection switches. The wearable electronic device can also support similar functions for other sports and physical activities.

A wearable device and a method for monitoring a movement state by using the same are disclosed. A sensor is provided in the wearable device. The method comprises: controlling the sensor to collect movement data of a user when a monitoring process starts; extracting one or more features for identifying the movement state of the user from the movement data to obtain test data; and matching the test data with stored template data representing predetermined movement states, to obtain template data that successfully match the test data, and determining occurrence of a movement state corresponding to the matched template data associated with the test data.

Disclosed is a last lap light apparatus with extendible pole length, for submersible use in signaling, for example, in a swimming competition.