Last Sand Flag Football

I been playing sand flag football on every Monday for past 8 weeks. Today is last and we won! Well, actually won 'cause other team never show up ("Forfeit"). So, we play against our own team for the fun. I wonder why when team play against their own, they usually play much better, more relax, and Fun than against other team. It is 35 degree outside and windy. I know someone run in sand field with barefoot. BRRRR