ORIGINAL: rybohunter
I think a lot of guys just havea big gut
But seriously (and I'm no form coach) it just seems like proper posture (like you are supposed to have when sitting in a chair) just makes for a more comfortable stance when you are shooting your bow. That's just my guess.
...So far, I have a great metabolism and I workout, so no gut...yet[8D]
What you say makes sense, and MOST of my body feels better when I intentionally arch my back, but my bow arm seems to become much more prone to movement. It might be a form issue somewhere else completely isolated from arching my back, who knows.