It is easy to add multiple group members into one account, such as your family or friends, and you can add as many additional members as you want. You can also log results for those additional group members but only if you have purchased two or more of the same Challenge event.
How to create a group member:
Note: Log results can be assigned to a user as per the number of events purchased. For instance, say that you purchased 2 of The Commander 100 Mile Challenge but have 3 members in your group. You will only be able to log results for 2 of those members. If you want to assign that same event to the third member, you'll either have to a) delete the group member who has logged the event before, b)delete all the races of that member from the race logs, or c)purchase another event for the third user.