-Polar heart rate monitor systems use a body strap and a watch-computer to measure your heart rate, calories burned and other exercise data.
-The Polar systems send your workout information to most cardiovascular exercise equipment in the gym and display your heart rate on the machine LCD even if you're not holding onto the hand sensors.
-With many watch-computer models, you can also upload your workout data to your personal computer and track progress.
-This allows you to set workout goals and optimize time spent training.