1. Make sure the sport they are playing, that the item can't cause a real injury
2. Make sure the surrounding area is acceptable so like no slippery floor, or marble floor
3. Make sure every kid is doing the steps correctly or game, if not, then teach them and separate from kids doing good.
( I don't know if you meant ruled steps, so I made some, this is just what I think, hope it's what you want. )
Sore muscular flexible is for the bottom part and endurance, strength, stretching,
