Your personal training coach for multi-sport athletes the Garmin Forerunner measures sport specific metrics powered by an extremely accurate Garmin Elevate? wrist based heart rate monitor, with real-time results displayed on the high resolution 128px display. Have more fun working out by using the built-in training modes for running, biking and swimming and help keep your training regime fresh and enjoyable. Lightweight and very powerful the Forerunner 35 measures your heart rate 24/7 and gives you vibration alerts when it?s time to get moving.