Prosperity Park, on 22 December 2011 - 12:51 PM, said:
A locked arm above your head can balance far more weight than in front of you. This is the difference you need to observe. That weight above your head is similar to the force applied to it through direct impact of a strike via a punch or a kick. The area you are striking is not designed to carry the same impact or force threshold. This is why it works. This is why even human beings with no tools can bring down a house with their bare hands. This concept scales up just fine up until over 400' when the cellular structures are more likely to collapse upon themselves. Although, this is a living organism opposed to a walking building.