People are taking the mick but in reality the office environment is really bad for your health, mainly because you have to sit in the same position for hours looking at a bright screen. It’s not natural.
I’ve done manual jobs for years and never had any problems but since working in an office I’ve had a bad neck and back, and terrible skin issues from the air conned air.
I did a manual handling course once to teach me how to teach others and the guy teaching it had been a paramedic until recently. He said one of the worst back issues he had seen had been a guy who wasn’t sitting properly in an office chair, hadn’t lifted something right while sitting down – something went ping in his back and they had to inject something in his back to lift him out of the chair.