I have some flat bottomed shoes, and some sneakers. I always ran in the sneakers for my meets, and my times were never that great. 13.2 is my best (100m)
Now, these http://www.zappos.com/n/p/p/7291654/c/86335.html
or http://images.nearbynow.com/productimages/kohls/b7/0004c7b7_md.jpg
I seem to run heel-to-toe with sneakers, toe only with the diesels.
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