Stridekick's Group Program subscriptions include our exclusive team challenge mode. These are run in a leaderboard fashion based on averages. Therefore, teams compete to see which team can get the highest participant step average. That means you can uneven numbers of participants on your teams and it is still a fair game!
Once you've activated your subscription reference the article 'Create a team challenge in GEM', to walk you through the steps of submitting a team challenge request form!