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Boxers also punch quickly and powerfully, they find it difficult to break concrete blocks because of their technique. Boxers throw punches with follow-through to gain maximum momentum (golf and tennis players follow-through for the same reason) so they may knock an opponent down. But the impact itself is diffuse. A Taekwondo punch has no follow-through. It lashes out like a cobra and then withdraws instantly When a black belt hits a block of concrete, the fist touches the block for fewer than five milliseconds so all the striking forces are transferred to the block.

A well-thrown fist reaches its maximum velocity when the arm is about 80 percent extended. Focus your punch in your imagination so that it terminates inside the block, rather than on the surface. To deliver the maximum power, you want to make contact before the slowdown begins.

Remember the equation, Force = Mass x Velocity2. The moving hand generates force while the stationary brick generates no force; therefore the hand overpowers the brick. If the the hand was stationary and the brick was  dropped on it, then the moving brick would injure the hand.

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