Best fitness tracker: Fitbit Flex vs Jawbone UP24 vs Nike FuelBand SE vs Garmin vivofit!

Fitness trackers are all the rage these days. The iPhone 5s already includes an Apple M7 motion co-processor that lets apps monitor steps taken, calories burned, and more. If you want a dedicated fitness tracker, though, something you can wear in the rain or in the shower, while running or while in bed, then until an iWatch comes along, you're going to have to get a Fitbit, Jawbone, Nike, or Garmin. But which one should you get? They aren't cheap and they aren't all created equal. That's why I've taken an in-depth look at the most popular ones!

Note: We initially started our tests using the Fitbit Force. We swapped it out for a Fitbit Flex since Fitbit recently recalled the Force due to skin irritation. The main differences are that the Flex doesn't have a full LCD like the Force and it doesn't track stairs. Other than that, they're pretty similar in every other way.