In a pinch, I'll just yell out that boys are lumberjacks and girls are planters. Or white shirts are this and colored shirts are that. But my favorite way to play is by handing out colored rubber wristbands (which is the absolute best way to create teams). Then, I have the image below projected onto my screen. Every minute or so, their job changes. Since I have some struggling readers and students who's primary language isn't English, I'll use emojis so they know what their job is. With all the moving and lunging, I've found that players get gassed very quickly. To work around that, I give them little, low-intensity breaks where they can climb the rock wall, work on balance boards, dribble basketballs, etc. This is also perfect for me because I teach in a small space and can only have so many players running around at the same time safely.