If you don't have the time to organize, start and lead your own Buddy Challenge, you may want to simply join a Buddy Challenge that's being organized by someone else within your Buddy network.

To join an existing Buddy Challenge, you need to be invited by the leader (who needs to be within your Buddy network):

• You'll receive an invite message in your Message Center on the site from a Buddy who's starting a Buddy Challenge—just open the invite and click the "accept" button if you want to join the Challenge. A notification message will be sent to the organizing Buddy, and you'll be added to the list of Buddies participating in the Challenge.

• You can also click the "decline" option in a Challenge invitation if you know another one of your Buddies is going to be starting a Challenge (or, you decide you want to organize a Challenge yourself).

• The Club member that sent the Buddy Challenge invite will be notified whether you've accepted or declined in their Message Center. The moment you "accept" a Buddy Challenge invite, you will be added to the list of Buddy Challenge participants. At that point, when you click on the "Challenge Central" tab on the site's main top navigation bar, you'll be taken to the home page for the Buddy Challenge you're participating in.