I had a similar background. Grew up doing manual labor on a family farm, then college then active duty military for several years. There's a huge difference between "manual labor indoors normal hours" and "manual labor outdoors all hours all weather". For the first 15 years of my software career I couldn't believe my good fortune; awesome pay, intereting work, smart coworkers, dry and warm! Heaven!

Now at 20+ years in software I'm so fried I can barely push a key a lot of days. My body is wrecked because I haven't kept fitness up. I need to make some changes for sure. Looking at possible hardware start up now.