To create a group, go to Runtastic.com and click “My Groups” in the menu on the left. Click “Create Group” on the right and enter a Group Name and Group Description and click again “Create Group”.
After that you are able to invite other users and friends to your group. Just click the button “Invite Members” and share the link with your friends. You can also directly invite Runtastic users by clicking the plus next to the name.