Eye exercises.

Children in primary and middle school have to do them every day for five minutes (primary school has to do it twice a day). The eye exercises are supposed to improve your vision and make it less likely for you to need glasses in the future.

One year in China and I'm still not completely convinced eye exercises do work. I do however know it is five minutes where the kids are quiet and focused. So I suppose even if the eye exercises don't make their eyes stronger, at least they get a short break to recharge.