Taekwondo masters demonstration

After watching that Taekwondo strength demonstrated by an individual, now this is another video that shows the power breaking of planks, bricks, etc by a group of Taekwondo masters. There was one who did a back hook which break a few planks at one go that looks rather nice and impressive another one was his 540 back hook which strike at the bricks. The rest showed other techniques such hand techniques and back thrust.