WHY: Builds the oblique abdominal muscles, which keep you steady during the final stages of a hard run or ride. "If you don't have strong stabilizers, fatigue will set in even more quickly," says Dixon.
HOW: Place feet in straps, toes down, and assume a perfectly flat plank position on your forearms. Pull your right knee in toward your left elbow. Return to start and repeat toward right elbow.
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