> I'm curious as to what 30 years of sitting, programming, drinking cool-aid will do to health vs 30 years of lugging steel... Trawler fishing, I agree - v.dangerous, not good for you!

In those 30 years, you will likely accumulate injuries that make it harder to keep doing the work. My father is a general contractor, and though he does the work far less often than those who work for him, he has accumulated a number of minor injuries that stay with him.