Olympian and Slay Athletic founder Louise Hazel shares the ab workout that keeps her core stable and strong for runs. Hazel begins with a dynamic warmup that includes rotational exercises to activate your muscles. Then she moves into a circuit that includes beast plank, bird dogs, and heel taps. Hazel introduces us to a vaulter's ab exercise based on the track event. There are plenty of planks in this workout, so be sure to take breaks or shake out your wrists as needed. This cross-training routine is perfect whether you're training for short distances or a marathon

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