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The Endurance of Speed: The Revolutionary New Way to Train for Marathons & Half-Marathons The Endurance of Speed: The Revolutionary New Way to Train for Marathons & Half-Marathons by Jason R. Karp
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“But if you want something you’ve never had, you must do something you’ve never done.”
Jason R. Karp, The Endurance of Speed: The Revolutionary New Way to Train for Marathons & Half-Marathons