I used to work in a stockroom, hauling around big CRTs, Fridges, Freezers, Cookers, Hobs etc. I used to think it sucked at the time, but we had a decent amount of fun, messing on with trollies having races, smashing up old broken stock, etc. (Kinda like the bit in the 40 year old virgin where they're messing with tube bulbs) but it was definitely hard and tiring. It's also the most exercise I've ever done I think. Try unloading a van at Christmas time while the phone for customer stock is ringing off the hook. It gets old. But there was no worries to take home. You knew the routine, and it was easy to follow. I was there for about a year and a half.
I moved into call center working after I finished Uni. Sometimes it was really rewarding, but it was a hell of a different kind of draining to the 'muscle work' of the past. One guy who's PC had fucked up lost all the pictures of his recently-dead wife. That phonecall will be one of the worst conversations I've ever had in my life, no question. I only lasted 6 months.
After a while, I moved into my current job. This is both the best and the worst. There are long hours. The pay given the pressure and responsibility involved is terrible. There's stress to the point of breaking (I've actually had clinical depression for the last year due to it) but it's arguably the most creative and involving that I've ever done in my 10 years of working. I've been there since 2005.
The key is definitely to find something you love and work to live, rather than live to work. I could get an easier job that probably pays more and doesn't affect my mental state in quite the same way. But it'd be far less rewarding at the same time. And I know that I couldn't work in a job that I don't enjoy.