A challenge is a group of segments which you can set up or join, to try to become the best on all the segments and having your efforts ranked in a leaderboard.
A public challenge is a challenge for everyone to join. A private challenge is challenge intended for your friends. All challengers on a private challenge has to be invited. On a private challenge, you can invite as many as you want, and the other challengers can also invite as many as they want. If you don't get an invite email, you can't join the challenge.
All segments has to be created by an existing activity. If you have an activity where you've completed the segment you want to create, follow this guide:
Now, read this article on how to create good segments.
We're working to support more and more devices (brands) in HurryUp. Read more here: /compatibility
