Want a stronger core? Skip the sit-ups
![stronger-core-plank-abs](https://www.health.harvard.edu/media/content/images/bigstock-fitness-core-plank-diet-concept-63180394(1).jpg)
Sit-ups once ruled as the way to tighter abs and a slimmer waistline, while "planks" were merely flooring. Now planks — exercises in which you assume a position and hold it — are the gold standard for working your core, while classic sit-ups and crunches have fallen out of favor. Why the shift?
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