Shortly after we moved into the house, somehow Stuart invented a game with the boys called The Number Game.  Since then, the boys are obsessed with it and want to play it every night after dinner.  Basically Stuart would ask an addition question (ie.8+8), and if the boys answer correctly, he would try to catch them.  Logan tries to answer well so he can be chased.  Connor also actively participates by saying random numbers in hope to answer one right.  The boys get so excited and giggle through the entire game.  They also definitely get plenty of exercise from running around the house.  I tried to play the game with them once or twice, but catching them was not easy and was quite tiring.