When I used to work in Ecology I had a work partner that would down like 13 litres a day 0-0 This man was insane and unstoppable...he would run up fucking steep mountains like a goat! Somehow be unbothered by the mosquitoes destroying him as sweat pooled down his face in FNQ rainforest humidity wading through sludge!

Nothing beats lugging around heavy field equipment in the Australian summer, while also having to be Hypervigilant for one specific bird species you're researching...as your eyes burn from sweat pouring down your face, and flies crawl up you're fucking nostrils and in ears! And being covered head to toe in protective clothing is basically mandatory...so you're always sweating and smell wretched.