Usually we associate hard work with sweat on the brow and perhaps aching muscles, and there is certainly a lot of that to be done. There are houses to be built, crops to be planted and harvested, there are roads to be repaired, cars to be built - you know what I mean.
There are other people that work hard every day who never break a sweat. They work in offices or in stores; they sell insurance or help us buy houses. Some of these folks work long hours in front of a computer screen or talking on the phone or, well, maybe even teaching in our local schools.