You’ll get used to it in a matter of weeks. I used to work landscaping shoveling & slinging a weed eater in 90-100 degree southern summer days while working out. I wasn’t some big burly dude either, more like 120lb soaking wet in high school, the only way I got through it & lifting was by sheer will. My mom did a great job of teaching me that sometimes there’s no trick or way around it, you just gotta put your head down & grind harder than anyone else is willing to. t’s crazy what your body can get used to. Get it man, after all that manual labor & gym you’ll be able to eat so much more and stay lean!