Today I learned that when people are electrocuted and thrown far distances, it is a result of a sudden and violent muscle contraction and not the result of the shock. This has raised questions as to the actual strength and capabilities of the muscles in the human body.
Our strength is kept within safe limits by pain. When that pain is neutralized, humans are capable of rather tremendous feats of strength, although with a high risk of structural damage to the body.
It is a well-known fact that humans are much stronger than what they are consciously capable of. Our brain doesn’t allow us to use our maximum strength though because of the risk of damaging our body. I read about a man who threw a 1200-lb boulder off of himself after it had fallen on him. He dislocated both his arms, also breaking one, and tore a lot of muscles in the process, however.
Basically, our brains let us do whatever kills us less.