See your heart rate on your wrist say goodbye to chest straps with the tomtom runner 3 gps watch the built in cardio sensor tracks your heart rate straight from your wrist no more sweaty bands and chafing track all your sports mix up your training run gym bike swim treadmill freestyle track different sports with dedicated modes on your gps running watch and make them all count run smarter with real time information just look at your gps running watch to get live stats on the go time