I make most contact with the ball of the foot (big toe) with both feet...but I try to keep the whole foot in some contact at all times. Because I'm not the most flexible person out there, my back heel comes off the mat much more than it should. I've never really thought about it as an "edge" kind of thing...but since the big toe is on the inside edge, I guess that's what gets the most contact. My goal would be to keep the whole foot in contact, but then, I'm flatfooted, so...
Ron
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