You've probably heard a dramatic example of someone being able to lift a car in a moment of great peril, or achieving some other physical feat while in danger.
The reason for these is adrenaline. It acts on muscles and allows them to contract more than when the boy is in a calm or neutral state.
The theory goes that we only use a small percentage of our muscles' capabilities. This extreme stress causes us to involuntarily use our muscles beyond the limitations of normal voluntary use.
This theory is supported by what happens when someone gets electrocuted. Sometimes this person can be thrown a notable distance away from the shock.
The real cause for this is not the shock itself, but the sudden, violent contraction of their muscles as electricity runs through their body.
While adrenaline and electric shock aren't 100% related, they do support the idea that our muscles can achieve far greater things than we are able to ask of them normally.
