I've done LOTS of manual labor jobs -- delivering soda (2 summers), siding houses (2 summers), framing houses (1 summer), roofing houses (weekends for 5-6 years), roofing commercial buildings (1 summer), mate on a fishing boat (1 summer), and worked my ass off at those jobs. Mostly because I enjoyed being outside and working with my hands, and because I felt a great sense of accomplishment in seeing the fruits of my labor. But I learned from those who I worked with that those jobs are back-breaking and thus relatively short-lived, and I took the advice of many of those people to "work with your head, not your back, kid." So I went to law school.
Got caught up in the On Campus Recruiting (OCR) whirlwind (the NFL Combine for prospective lawyers) and worked my 2L summer for a big firm. Figured out right away what a shitty game that was. As one friend put it, as an associate, you get a big slice of shit pie; making partner just gets you a bigger slice of that same shit pie. Knew for certain I wasn't cut out for that life.
So I went to work for the government. Worked hard in early years (but never more then 40 hours/week), rose through the ranks pretty quickly, and now, after 20 years of doing it, my heart just isn't in it. Hasn't been for years. So I do the absolute minimum I have to -- which is more than enough since I've been doing the job for so long; most legal briefs I draft are cut-and-paste jobs from previous work (the law in my area just hasn't changed much in the last 10 years). So yeah, I coast my ass off, and I'm fine with it. Because the work gets done. But there's zero personal satisfaction. I'm fine with that, too, as I have many pursuits outside of work that provide tons of self-actualization and personal satisfaction.