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Factors to Consider
Wearability: Make sure the tracker you get is comfortable and convenient to wear. Most are worn on the wrist, though you can also find designs that clip to your clothes, go around your ankle, or attach to your shoe.
Display: Some trackers have full color screens, while others have simple LED displays. Others have no displays at all and stats must be checked from an app. Decide how you’d like to see your stats and notifications, and look at the trackers that use that method.
Your activities: Make sure the device you get tracks the specific type of exercise you do. Most will track basic activities like walking, running, and going up stairs, but for more specific activities like cycling, swimming, or pilates, check to make sure the fitness tracker will recognize and accurately track the activity.
Battery Life: If you're looking for constant activity tracking, even while you sleep, you won’t want a tracker that needs to be charged every day. Some trackers get around this by using watch batteries that will need to be replaced but will last up to 6 months at a time. If sleep tracking isn't a must, you can go for a charging device that uses more power.
Companion App: Most devices automatically sync the data they track to an app you can check on your phone or computer. Check out the app in advance to make sure it’s easy to use and has all the features you want.
Connectivity: Some fitness trackers will also display your smartphone notifications, but if you want more media features, you might want to look into purchasing a smartwatch that will also fulfill your fitness needs.
Compatibility: Make sure the tracker you like is compatible with your phone platform—some work on multiple platforms, but many are made specifically for one.

Features to Look For
Basic functions: Most fitness trackers record steps taken and calories burned. Many also include elevation tracking in order to count stairs climbed.
GPS: Casual exercisers may not need this feature, but serious runners and athlete want accurate distance tracking. This is a feature found mainly in higher-end fitness trackers, as well as heavier duty sports or running watches.
Heart rate monitoring: This advanced feature is found on heavier duty fitness trackers. Most have a sensor that sits against your wrist, which doesn’t always provide the most accurate data, so if this is an important feature to you, look into running watches that are built especially for that purpose.
Waterproof and swim tracking: If you want to wear your tracker in the shower, look for ones that are waterproof. Some trackers are even designed to be taken into the pool, and will track your swimming.
Sleep tracking: Many trackers gather data while you sleep to get resting stats that are useful to compare with your activity. Some monitor as much as bpm, respiration rate, and body temperature to give you a detailed report on your light and deep sleeping patterns.