[Tungrus]

responses listed above are great!

I personally would start from training team members (both adults and students) to have fun doing whatever they are doing. Everyone is not a builder, everyone is not a good communicator, encourage them the try something outside their comfort zone. Probably we will learn more as a team when we work in a healthy and friendlier environment without trying to "beat them, they are our nemesis" attitude. Everyone should try to win but not at the cost of fun. Also remember fun is within the normal discipline and team rules.