4. Fitbit Surge
BEST FEATURES: Activity mapping; calorie-burn algorithm; battery life
Built-in GPS lets you map your run, ride, or hike with an app on your handheld device; you can also track heart rate and calorie burn across different sports like yoga, spinning, and circuit training using a unique algorithm for each. One charge can last up to a week—impressive for a continuous heart-rate monitor; and sleep tracking helps you get the perfect snooze.
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