I worked landscaping for 6 years, the conditions weren't too bad but it sure is hot and humid down here. The worst was when I picked up a job with an irrigation fellow, he was too cheap to buy a trencher so I was hand digging trenches for a few weeks, my back has yet to forgive me. The most frightening work I did was with an old timey electrician for a few months. I was mostly running around, pulling cable, and just basically helping him to be in two places at once. The guy was so nonchalant about electricity though, it scared me. He'd kneel on his little rubber mat and start poking his pocket knife in places I'm sure it's not meant to be poked to see if something was "live" or not. I thought he was just messing with me at first but his hands were pretty gnarly and he'd get sparks often enough.