Sit-down or stand-up to paint?

I try to sit, but I can't. Before I know it I'm standing again. I have a stool which is nearly at standing height, as most things are, because I'm short. This is the first thing I trip over when I stand up and walk around. I trip over it at least once a day, but I leave it there so I'll try to sit, because man, this is hard work!

Does everyone have one muscular shoulder and one wimpy shoulder too? Luckily I have a 25 pound baby I carry on my left hip, to balance it all out.

I read somewhere that professions where you keep your arms elevated (like conductors) have lower risk of heart disease too.