I work in pretty much manual labor. You wouldn't think cleaning a rabbit hutch out is hard work, but then you do 15 of them. Then you clean out 12 reptile vivariums, 4 small mammal vivariums, 2 monkey cages and a skunk, move all the bedding, food, rubbish bags and animals around, then sweep up the giant mess made on the floor, then cycle home... Yeah. I'm knackered when I come home in the evening. I'm pretty glad I only do it once a week now, when I did it 5 days a week for my apprentiship, I was pretty dead for the weekends!
Bunny trainer extraordinaire!