PUBLISHED 10/13/2006
The RS100's customized heart-rate zones are based on your actual resting and running heart rates, as opposed to the one-size-fits-all formula found in other heart-rate watches. This makes it easy for runners to train efficiently and maintain a workout log matching up their best and average heart rates with their splits. Our testers also gave high marks to the watch's instant fitness reports--including what percentage of your total calories burned are from fat. $110; 800-227-1314; polarusa.com
