Elite runners and coaches swear by this watch, which doubles up as a heart rate monitor.
A lightweight chest strap with a detachable heartbeat sensor comes with the Polar Electro RS800G3. The sensor connects to the watch wirelessly to show heart-rate readings.
The watch's display is large enough for clear viewing during a workout. Just push the main button once and you'll see your heart rate, running speed and time lapsed - all on one screen.
Heart-rate zone alarm - a function to alert you to move on to greater degrees of intensity - is used by professional athletes to combine aerobic (low-intensity) and anaerobic (high-intensity) exercises in a single session.
Apart from it, there is also another advanced training aid - global positioning system (GPS) tracking.
GPS tracking measures distance and speed in real time for training across disciplines including cycling, in-line skating and kayaking.
