Measuring and checking apparatus and instruments in the nature of smart swim watches and wearable biometric sensors for measuring heart rate, oxygen saturation and body temperature; signaling apparatus and instruments in the nature of LED swim caps for visibility in open water and vibrating wristbands for lap alerts and pacing; lifesaving apparatus and instruments in the nature of inflatable safety buoys worn by open water swimmers, emergency alert wristbands with global positioning system tracking and personal flotation devices; teaching apparatus and instruments in the nature of downloadable software for use in swim training and augmented reality swimming goggles for guided swim technique correction; apparatus for recording, transmission or reproduction of sound or images or other data; downloadable computer software, including mobile application software, for analysing, tracking and measuring a swimmer's bodily movements, physical activity levels and speed; personal electronic devices used to track athletic performance, goals and statistics; wearable activity trackers; smart watches; smart goggles for sports; portable electronic devices in the nature of watchbands and eyewear that communicate data to smart watches, mobile phones and other electronic devices; global positioning system (GPS) apparatus for tracking athletes during athletic activities; portable electronic devices for monitoring and analysing athletes' movement in sports; electronic apparatus for measuring, testing and enhancing athletic performance; electronic devices in the nature of personal digital assistants for sports coaching; electronic sports aids in the nature of wearable stroke analyzers, namely, devices worn on the wrist or goggles that track stroke type, count and efficiency, underwater non-medical heart rate monitors, namely, sensors for providing real-time heart rate data during swim sessions, smart swimming goggles, namely, goggles with built-in heads-up displays showing lap count, split times, distance and pace, digital lap counters, electronic motion sensors, namely devices for analyzing swimming form and providing corrective feedback, underwater audio coaching devices, namely, headphones that deliver real-time coaching and music while swimming, pool-based video analysis computer software installed in pools to record and analyze swim technique, virtual training platforms, namely, computer software that simulates swim workouts and tracks progress over time, smart swim caps, namely, caps embedded with electronic sensors to monitor head position and streamline alignment, and hydrodynamic resistance sensors, namely, devices worn by swimmers that measure drag and resistance to help swimmers optimize body position; measuring apparatus with electric and electronic monitors used to measure speed, swimming stroke count, swimming stroke rate, distance covered, time, heart rate and calories burned in sports activities; pedometers; cases for spectacles and sunglasses; swimming goggles; life buoys; life belts; diving suits and diving gloves; bags and cases adapted to contain digital music players