I grew up on a Dairy Farm so hard work isn't a problem.
I get paid to run into burning buildings now, so fear is not an opotion.
I spent most of my Young Adult life in some of the nastiest places on Earth. I even spent some time on a two way firing range. (hazards of my chosen profession).
Got used to sleeping wherever I could. I ate bugs, snakes, lizards and the like with no ill effects. Spent a bunch of time on the briny without issue.
That said , I have aged seriously in the past few years and my earlier occupations and lifestyle have taken their toll.
I like my A/C, my Satellite navigation system, Digital TV and Computer. Today, I'd rather read a book or chat online with like minded folks than cruise the deep.