You should allow yourself to stretch every so often when playing video games. Your body gets stuck doing the same motions repeatedly. When you stretch your muscles, you will not get cramps as easily and you reduce the risk of having blood clots. This is for your health. Use the parental control settings available with most games. Perhaps the game is able to be played over the Internet. If you can play it online, see if it has parental controls. You can also check out your kids' friend requests and limit playing time too.