4. MIO’s Triumph watch ($129.99 for the watch/$50 for the Fit Stik; www.mioglobal.com)

Why we like it: Just like the Timex Health Tracker, the MIO Triumph watch lets you track how many calories you’ve taken in and how many calories you’ve burned from exercise. However, it also comes with a strapless heart rate monitor system and a built-in alarm system that warns you whenever you go over the calorie limit you’ve set for the day. What we really thought was unique was that MIO also has a device that helps you determine what your true biological age is, based on your health. All you do is plug MIO’s FitStik (sold separately) into your PC, wear the chest strap it comes with, then perform a series of breathing exercises and other tests that can determine your stress and fitness levels and if you’re as healthy on the inside as you look on the outside.