I enjoy hard labour, just not for 40 hours or more a week, every week. People doing traditional agriculture have to bust their ass during planting and harvest, but the rest of the time they aren't working that hard.

Same with sitting at a computer, doing it all the time drives me insane. I've got various hobbies and interests I'm passionate about, just not so passionate that I want to do them full time for the rest of my life.