Here’s what sunburn REALLY is.
When we get sunburn, that’s not the heat of the sun that’s hurting us most of the time, but it’s little skin cells killing themselves to protect us from skin cancer.
Not so cool if I think about it.
We have an internal regulator that prevents us from using our full strength. Or muscles usually only work at about 60% max of what we are capable of.
In extreme life and death situations these regulators stop and we are able to use our full strength. This is where stories of people tipping over cars and similar come from.
These regulators are because at full strengh we heavily damage our bodies. Essentially, you could lift something to the point where it is either lifted or your arm just breaks instead. I believe there has also been someone who ran so hard his leg broke.