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Karlie Kloss' Gym Bag Essentials

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ZURICH, SWITZERLAND - NOVEMBER 15: Karlie Kloss attends the Mercedes-Benz Fashion Days Zurich 2013 on November 15, 2013 in Zurich, Switzerland. (Photo by The Image Gate/Getty Images) | The Image Gate via Getty Images

The runway alum and newest addition to the Nike family shares the “old-fashioned” secret to a flat stomach, the power breakfast that fuels her day, and why she still gets called out in Spin class.

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