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The Best Core Exercise — Advanced Human Performance Official Website | Home of Dr. Joel & Joshua Seedman
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![andrea on Twitter: "This single leg side plank variation challenges the core and hip muscles at the same time. https://t.co/FHkQbeHvQN" / Twitter andrea on Twitter: "This single leg side plank variation challenges the core and hip muscles at the same time. https://t.co/FHkQbeHvQN" / Twitter](https://pbs.twimg.com/media/DR_OPzUWAAM6u-I.jpg)
andrea on Twitter: "This single leg side plank variation challenges the core and hip muscles at the same time. https://t.co/FHkQbeHvQN" / Twitter
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