YEah, strength is like that, 1 is a weak child or elderly person, and 5 is like the best humanity has. A skilled boxer, a 512kg weight lifter.
As for where the punch is, I'd say the head. I'm just trying to make a simple power scale, but have taken it way too far.
In my fictional universe, I have several reaches and transformations and whatnot. Each power level is determined by the average power of a human.
Humans are usually in a power scale of 1-5.
This means that someone can be 5 times the strength of someone at maximum.
Now. I need to figure out...