Features

A heart rate monitor is usually worn like a wrist watch. Some models include a strap worn around the chest, while others have built-in sensors. Most heart rate monitors, besides displaying your heart rate at the time, have time and stopwatch functions. Commonly, they have an alarm that tells you when you're out of your target zone. More advanced models have recording and storage functions and record and retrieve lap times. Some calculate calories burned. High end models have testing functions and advanced features that are even used in exercise labs.