any of them! . . .the other night I was at wrestling practice for the Adrian Area Club (boys and girls ages 3-17) and I watched two eight year old boys get in position to wrestle, and right before the on in top position would make his move he would tickle his opponent, and then the other boy would do it back. . I thought it was so adorable. .and also good to know that eight year old boys and I both like to have silly fun while we wrestle. .