Active folks who fire up the latest version of the Fitbit app will see a new section tucked away in the sidebar: Challenges. Contained within is a way to take the fitness-minded company's Android experience and make it more social. Users now have the ability to challenge up to 10 people and compete with them in any of three contests.

Fitbit wearers can compete to see who can complete the most steps in a single day, over the weekend, or throughout an entire work week.

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