Many reasons:
* Being is weird positions.
* Much longer hours vs typical gym workouts.
* Doing many of the exact same repetitive moves.
* Gym workout switch around. Doing a leg day, and then letting those muscle recover.
* More likely to work with injuries, where a gym workout might take it easy on a muscle or limb that has been injured.
* More likely to get injured tripping, having things fall on you….etc. A gym is stable, secure, and everything stays the same. Job sites can be all shapes and sizes, with varying levels of safety.
I do both. I’m a qualified PT and work in a construction trade. Gym equipment and exercise is designed to target and strengthen natural bodily movements, the equipment is ergonomic and correct form is (supposed to be) paramount. Everything is tailored to keep you safe and make you stronger, that’s the whole reason you are there.
Working on a building site is quite the opposite, things such as materials or kit isn’t necessarily designed to be handled easily it’s just designed for whatever purpose it has. I work with some equipment that feels like it weighs twice as much as it actually does because of this. Not to mention you are expected to get into awkward positions, work for extended periods without proper rest and get a lot of dangerous jobs done without asking questions.
IIRC Ronnie Coleman, 8 times winner of Mr. Olimpia is wheelchair bound, after 2 sugeries in his hips, 2 on his neck and 9 on his back, resulting in a fully fused spine.
Hitting the gym 24/7 for 8 hours and doing extreme stuff will hurt you as bad as a full time manual labor job and that is not counting the ammount of juice some of those guys get.
If you had to do your manual job for only a couple of hours (or less) and take care of your posture and movements you wouldn’t have back or knee pain as some of the old guys you know have.
Most old guys that go to the gym are probably rich and have the time and money to do it carefully.
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