Put your heart into those resolutions.

• Position: WHAT'S NEW? - Brief article

If you're going to trumpet all of those New Year's resolutions about losing weight and getting in better shape, at least give yourself half a chance to make them come true--with a polar product that matches your dedication level and won't break the bank.

The Polar WearLink ($69.95)--compatible with Nike+, iPod Sport Kit, or Sport Band--helps users understand how hard they are working during a run, enabling them to see beats per minute or hear feedback.

For those who want basic heart-rate-based features to keep their fitness training simple, there is the crosstraining FT4 ($99.95), which calculates what heart rate range is best for each user in order to improve the level of intensity during workouts; tracks calories so you know when to refuel (or how much to chow post-race); and shows calories burned, exercise time, and minutes spent in each zone.

For triathletes, runners, cyclists, and endurance athletes who are super-serious about their...