From age 16 at work I would regularly carry two 25kg (56lb) test weights often over quite some distance. I'm now 50, and probably only in the last two years have I learnt NOT TO! Now I just carry one at a time and use a trolley whenever I can.
I've slipped my disc badly twice and spent a fortune in the chiropractor.
HEED THE WARNINGS!
Or don't and when it feels like someone's running a Stanley up the back of your calf, you have "leakage" issues downstairs, you actually cry when you sneeze and can't crap for a week because the signals aren't getting through.....don't come running to me!
(Happened to a "mate" of mine... )