I'm kind of limited in my job options because I develop muscle stamina issues in my lower torso which makes it difficult for me to do anything that requires I support my arms above a certain level for very long, and I have hip problems which can make it difficult to sit for long periods or stand on my feet all day.
To top it off, my upper back/shoulder muscles tend to cramp up painfully at the end of the day.
My current job at school seems to have the perfect ratio of up time to down time though. I set up and control equipment for lectures and certain events. I'm usually never up for more than 30 minutes and I'm never sitting for more than two hours, and I get a lot of walking in between.