Challenges: Compete with your connections by creating a challenge! Go to the Leaderboard tab on the GCM home screen and hit the “create challenge” button. Invite your connections to the challenge and then choose the kind of challenge and timing. You can decide to run the challenge for a day, weekend, week, or choose a custom date range. Don’t forget to turn on your push notifications so you can stay up to date on the top of the leaderboard and who needs to pick up the pace. Challenges can also be created through.