Price: $109.95  

Athletes who train by running and those who are getting their first heart rate monitor watch will be well-served by the Polar RS100. The watch-based OwnZone program optimizes your fitness by determining your target heart rate and letting you know the level of intensity for each individual workout. You can track your average heart rate, lap times, and even how many calories youre burning as you go. If youd like to get a little more out of each workout, than the RS100 is the answer.