well when my instructor tells us to do breaking (every belt has to) for the black belts he tells me/the rest of us to do like drop kick, or triple round house (near 3d degree belt) or scisor kick round house, things like these , he makes us break some of the real thick boards, but for the color belts he gives them little tiny wood, that when u blow on it it can break (ok ok not that tiny) so that explains my school.