I think much of that has to do with how you work and maintaining good health. Plus modern tech has helped For example they small lifting devices that attach to

I think much of that has to do with how you work and maintaining good health. Plus modern tech has helped For example they small lifting devices that attach to ladders to bring roofing material up, think like a flat elevator that goes up and down. That takes alot of heavy lifting and climbing. Nail guns and other power tools also reduce exertion in general. I'm not saying it's easy but it's better