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 But the bones in the hand are protected because they are not rigidly supported like the board discussed above. The soft connective tissue (muscles, tendons, etc.) in the hand may absorb much of the energy of the strike, if the hand is held in the proper position. Also, recall that bone is much stronger in compression than in tension or torsion, so, if the hand is held in a position such that the bones are exposed to compression rather than tension, the bones will be further protected.

So the board should break before the hand does. Still, the ~4900 N available in the punch is much greater than the 1500 N required to break a hand bone. So, even with the safety margins, there is still a risk. Most of the safety margin depends on technique; holding the fist properly, snapping it out with great speed, etc. If the punch is executed properly, the board will break; otherwise, the hand will break.

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