We should offer as many people as possible both mental and physical challenges. If one does to much mental work one burns out and lacks exercise. If one does to

We should offer as many people as possible both mental and physical challenges. If one does to much mental work one burns out and lacks exercise. If one does to much physical labor one gets injuries and intellect declines. Doing the same work for years is boring and makes it harder to switch. You get stuck in a boring job. It would also be eye opening for desk workers to do mindless physical grunt work. A few days of conveyor belt or hurling heavy objects could go a long way towards loving your desk job while also a welcome distraction from it. Likewise, someone hurling heavy objects all week could do some basic data entry, man the phone line or do some other simple desk work. Get a basic feeling for the complexity of the organization. It doesn't have to be more efficient immediately. In the long run more work will get done with less effort.