Both times (Sunday and Tuesday), my stomach hasn't been too happy in the evening afterwards... I don't know if it's some sort of sympathy to muscular pain or if it just isn't used to being moved about that much. I'm hoping that the severity of the stomachaches will diminish over time - if they don't, then I'll ask for advice. Even just now, they're not on the same level as the 'chainsaw' aches that I occasionally wake up with for no reason.