I examined my form just now, and it seems I tend to hunch or round my back at the top/shoulder area, which seems is preventing me from arching my back. So that is what my problem is? When I arch my back and straighten my upper back it doesn't feel "natural". The book always says keep the natural arch in your back. I guess that is what throws me off, I expect it to feel natural, but it won't will it?
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