• Design, program, and store 5 workouts
• Interval trainer
• Lap splits with average, max, and ending HR
• OwnIndex measures VO2 max
• Three target zones
• Stores your last workout and a summary of your five previous workouts
• Stopwatch functions
• Watch functions

This is a hard-core heart rate monitor for runners who build variety into their training. With the ability to pre-program five workouts, the S210 can help you stick to your plan no matter what that plan is.

But one word of caution...although you can strap the S210 monitor on and just head out the door, you will need to spend some time reading the manual before you can take advantage of its more advanced features.

As with all Polar® monitors, the chest monitor is light. It could be slightly more flexible, however.