Split up 7 on 7 and let 1 from each team sit out then trade out
I think it's one third, but I'm not entirely sure.
Hope I helped to some extent!
Department of Health and Human Services recommends these exercise guidelines: Aerobic activity. Get at least 150 minutes of moderate aerobic activity or 75 minutes of vigorous aerobic activity a week, or a combination of moderate and vigorous activity.