Generally, physical work is not as rewarded in modern society as intellectual work. Almost anything physically grueling a human can do, a machine can be designe

Generally, physical work is not as rewarded in modern society as intellectual work. Almost anything physically grueling a human can do, a machine can be designed to do it better. If the human in question is expensive, a machine has probably already been designed to do it better. Personally, I just go for walks at random intervals during my workday. It keeps me from being completely deskbound, and also keeps my brain from getting stuck.