Wow - I mean OW!

So I just discovered that sitting on an oversized exercise ball for 4 hours while working on a craft project is not, in fact, as comfortable as it feels while you are sitting there.  Turns out that you are in fact doing the equivalent of a wide-legged squat (with support of course) for 4 hours and the muscles along the sides of your legs and your rear will be quite sore from the prolonged balancing. OW!