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"My goal is to break 5:00 in the mile this summer. What is the one workout I have to do? "

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Deena Kastor
๐Ÿ‡บ๐Ÿ‡ธ Marathon: Olympic Champion ๐Ÿฅ‡๐Ÿฅˆ
One workout to break 5:00 in the mile: Greg's game-changing strategy!
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