I used to play this is primary school. I think this is an oldie!
Two large even teams separate and stand in a line and link arms. the two teams stand at opposite ends of the ‘field’ facing each other. One team starts and shouts ‘red rover, red rover, we call ‘Helen’ over’.
Helen the has to run over to the other team and has one try to break one of the linked arms! If she is unsuccessful then she has to join that team, if she is successful then the 2 people who’s link was broken must join her team. the other team does the same.
The winning team is the one that has the most people.