Like fixxiegirl says, you can avoid diaphragm cramps by exhaling on the opposite foot. It's cool to get into a rhythm (forget it! That's harder to spell than diaphragm!) like three beats or five beats, so you always exhale on the opposite foot: Inhale, starting on the right foot, for two steps, then exhale for three, then inhale on the left for two steps, exhale for three, or whatever works for you.

How low is the pain, relative to say your hip bone (iliac crest)? Your stomach, if you are thin and especially if you are tall, can hang way down into your pelvis, and it's a little left of midline.

I don't know...

Nanci