Office jobs never help your long-term health, strength, agility and fitness, no.
I was saying this a while back, people were saying howcome nowadays there are so many gyms and personal trainers and diet books and so on, we didn't need so many thirty years ago, why do we need them now?
It's because so few of us do physically active jobs. Thirty years ago a lot more people were farmers, miners, loggers, or worked in factories. Now most people shuffle paper around or smile at customers. So they just don't get the physical activity during the work day, they have to get it in their leisure time or blow up into puff pastries.
Once I couldn't get a chef job for a bit, and so I went and worked for a few months in a sheet metal factory on a guillotine cutting 2-8mm sheet steel. The steel came in sheets of 1m x 2m minimum, and so weighed 40 or 100kg. Sometimes there'd be a 2m x 6m sheet, that might weigh half a tonne. A forklift would come over and put it on rollers, but I'd still have to shift it around on the rollers and make sure it was cut right, accurate within +/-1mm, so that was a lot of shuffling around of 100+kg.
And there was a lot of carrying around of scrap, and because me and a Polynesian guy were the biggest ones there, all the rest little Vietnamese guys, whenever they needed to move some machine or boxes they called on us.
My upper body and legs grew like mad, I ate like a horse, I didn't need any gym membership for that.
But then later I went back to cheffing, just standing around chopping carrots and eating lots of pasta really doesn't do much for your physique. And so after a couple of years I had to sort myself out, as I did this year.
So if you're doing some physically active job, exercise and diet aren't difficult, your lifestyle takes care of it - you might have to tune it up here and there, but you're basically on the right track. But if you're in the service industry, your diet and lifestyle will destroy you, and you have to take care of it outside work time.