Well the answer here is: other factors. Safe, supervised strength training is great, but construction workers do not have that luxury, but instead heavy stuff to carry in (unhealthy)positions dictated by the task itself rather than your training regimen.

Then there are toxic chemicals on site they are exposed to, which attack lung, skin, bones, muscles. Then there is dust everywhere all the time, wood dust, stone dust, plastic particles, metal particles. All not great for your lungs, skin an eyes. So the strength training alone would be great, and many construction workers do have a lot of muscle mass, but the rest ist just poisoned.

You can have confounding effects. Specifically note Cochrane’s Aphorism.

"The correlation between any variable and smoking is likely to be higher than the correlation between that variable and the disease."

If you aren't controlling for substance uses (which anyone who has walked by a construction site would know.) You are going to misread an effect. Smoking in particular is actually just that bad for you.

> it's widely understood, and scientifically backed up afaik, that strength training is healthy and good for longevity. Yet, if you look at people whose everyday jobs look a lot like functional strength training, eg construction workers, my general impression is that their bodies (age 50+) are in worse condition than the average population...

When it's a work, you're expected to show up and do it consistently every day. So you can't afford alternate days to get adequate rest and recovery time. Your body is gradually wasted away by the job. When it's more of a leisure activity, you can afford just not to do it and rest, when you don't feel well, so the combination of workouts and recovery time can be net-positive, health-wise.

imo they don't get a chance to recover. i don't think you can compare a whole day of back breaking work where you have to push thru any minor issues vs like a 1-2 hr workout session every day at your discretion.

> I get that there can be too much of a good thing etc

Similarly, people that run 45 minutes a day are in great shape. But if you run a half marathon every day, you will age quickly

You’re exactly right, too much of a good thing. And for hard strength training, you can hit that tipping point very quickly. Probably within an hour a day if you’re going hard

There's often a machismo culture in jobs like that, in which people neglect things like PPE or safety procedures. Or of course, abusive employer-employee conditions in which workers are exposed to hazards without their knowledge or ability to mitigate it. Obviously, not everyone participates, but it's widespread enough I think it could explain this somewhat.

Substance abuse and rest.

If you lift weights Monday and Friday, you give your body time to recover and get stronger.

People whose job is to lift weight, they don't lift things heavy enough and they don't give their body time to recover. They work everyday, whatever if their quads are hurting or not. It has very little benefits and only destroy the joints.

I think for a lot of manual labour, the tasks are repetitive and so they experience greater wear and tear.

TBH, a lot of pro-athletes have wear and tear injuries after they retire as well.

I think it's because while on the job you cut corners and everything. You don't, and often can't, use proper technique. In the gym, barbells are perfectly symmetric and balanced. On the job, you might carry something that forces you into a horrible posture. That can't be good for you

There is use and there is overuse. What you are also seeing is lifestyle and socioeconomic influences. Construction workers are not necessarily in the highest income bracket, may not have the same access to healthcare or have the mental, physical or economical bandwidth to take extra good care of their body.

Construction workers don’t get rest days.

Every one I know described the first two weeks as complete hell, until their bodies just stopped complaining.

But it still takes it’s toll long term.

Strength training demands proper rest. If you do too much training with too little rest you break down instead if building up.

It's not weird. Medicin works the same way: too much will be very bad for you.

My father worked concrete construction and stayed relatively fit from all the activity, but his skin was trashed from all the UV and he smoked into his 50s. I've never met a person with more wrecked hands since. It was like shaking hands with 40grit paper.

Construction workers are not known for taking care of themselves, and it's a notoriously machismo culture. Sun screen? ok dandy.

Because their jobs are not "functional strength training" at all and you're discounting all the negatives that come from that kind of work. It's borderline insulting to their jobs to make that comparison, to be frank.

Unless you get all your information from movies construction work does not train strength that much.

> Yet, if you look at people whose everyday jobs look a lot like functional strength training, eg construction workers, my general impression is that their bodies are in worse condition than the average population (who's not in great shape already), and far worse than people with sedentary jobs who do fitness training.

Really? That's not my observation.

This is probably about extremes being bad. Having an extremely sedentary lifestyle is bad, but also having an extremely strenuous one is bad too.

I used to lift weights regularly. I'd go to the gym three times a week for an hour or two at a time. I'm pretty strong naturally and thought my training was going quite well being able to bench 1.5x my bodyweight, squat and deadlift more than 2x etc.

Then I paid some guys to move house for me. Actually, my job paid, I have still yet to pay for this service myself. They were lifting whole chests of drawers without even emptying them. It was crazy. I've since done plenty of this work myself (moved house three times by myself), but I do take the drawers out etc. Basically I work more intelligently and take more time.

What the moving guys were doing is harder, less safe, and they are doing this day in, day out. Add to that poor diets (both seemed to be fuelled on crisps, Coke and fags) and the differences become more clear.

So, like with anything, don't be too extreme. Too much heavy lifting will be just as bad for you as too little.

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