It's a rare job that has no stress at any time! A person on an assembly line, where machines lift everything, may still be on his/her feet all day, and doing shift work, and may be stressed about layoffs, plant closures, and "did I put that rivet in right, or is this car going to fall apart when someone's grandmother is driving it?" A secretary may sit all day, but end up with eyestrain and headaches, and the constant pressure of meeting deadlines.
Or consider this: I spoke with two RNs, both of whom had done stints as In the end, what it comes down to is not only what you find demanding and stressful, but what you find interesting and fulfilling, and so worth the challenges that may come at you.