I want to leave this question extremely open, so what is your take on board and brick breaking? Maybe include personal best with dimensions of course, and anything else relevant. Personally I have broken a 5 board side kick and 5 board front kick. The boards being 1in thick and I don't know the height with no spacers. I also as of yesterday successfully broke 5 cement bricks with my step side kick. The bricks are 3in thick and are unsupported with a 1/4 in spacer.