Everyday Systems

Okay, I don't know why this is a sticking point for me, but why the sweater? Is the theory that 8 pounds swung at you would not hurt if covered with a sweater? What am I missing?

I now have a sledgehammer, so I might be starting this workout. Worst case, I am ready for future demolition/home repairs.

I'm pretty sure you're correct, the sweater won't prevent damage, but it at least won't be quite as bad as raw steel against soft services like walls, furniture or animals.