I think the less arch you have in yur back the better form you are holding since (as powerlifters demonstrate) arching your back enough causes flat to become more of a decline. Some times i see guys doing dumbbells with there feet in the airholding their legs up off the bench (hard to explain) . I guess maybe im thinking by having your legs up makes your core unable to be flexed during lifts.
Not really sure where im going with this one...
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