This core-isolating move demonstrated by sprinter Jodie Williams is called the Opposite Arm & Leg V-Up. Why do we keep talking about the core? Because it's essential: a strong core affects all aspects of fitness. For more complete NTC routines, including Jodie Williams' bonus workout, download the NTC app here to #makeeverymovecount: http://go.nike.com/06tqgv1g
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