A lot of schools, my daughter's included, have banned tag and dodge ball at recess. There are restrictions on basketball, tag football, and kickball. They can't hang upside down on the monkey bars or sit on top of them because they might get hurt.
Her taekwondo class this week was "fun week" and they did leapfrog, log jumping over each other, and piggy back races. They were crashing to the mats left and right as they tried to get on each others backs and trying to hang on without touching each other. They were falling over each other, off each other, and on top of each other.
And you know what? No one got hurt. And it was funny.