In my martial art,yes,we really use inner strenght,and it's not "magical",it's science proved,my master was a scientist,and he did some research with his scientist friend,he said that our technique trigger a chemical reaction of a compound (totally forget it's name) and an acid (or enzim,i really suck at chemical) which releases energy,and we really can feel the energy flowing through our body,you may hear that the men breath with *csssss* noise before they hit it (i'm not sure about the one in the video),that make controlling the breath easier
Yes,breaking object isn't a good way to show martial art,i prefer to show the "blind seeing" ability,and we have helped many blind men by teaching this technique,but it still pretty scary to see blind people riding bicycle in the road,haha. Science proved as well,i can explain it if you want. but it seems that there's not many videos about it
I've learned this martial art long enough and i'm not full of fairy tales,honestly i don't like fairy tales
P.S if my signature looks childish and "non-realistic",i don't like anime,this is my friends signature