Positioning and using your body efficiently...that comes from actually working. Trying to get the shingles up to the roof, pushing the lawn mower for eight hours, carrying a load of wood for the fire, etc.
Nobody seems to work anymore except for red necks in the country. And I mean north, south, west and east, rednecks can be from anywhere.
Say what you will about rednecks but our country would not be what it is today without them. They are critical to our infrastructure and gittin'er'dun...: )