I cannot tell if most karate demonstrations are fake, but breaking some wood or concrete is regularly done properly in demonstrations. I practiced karate during

I cannot tell if most karate demonstrations are fake, but breaking some wood or concrete is regularly done properly in demonstrations. I practiced karate during high school and college and we were breaking stacks of ebonite electrical contactors in high school for fun, as we had a large supply of these. Most people were able to break 1 or 2, the top did 5-6, that stuff was hard but we were young and stupid and did a lot of crazy stuff (still stupid these days, but no longer young :) ).