A Single ‘Ab Test’ for a Stronger Core (and how to do a plank CORRECTLY!) #ancientcoins

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A Single 'Ab Test' for a Stronger Core (and how to do a plank CORRECTLY!)

https://youtu.be/v8xd_UVpzw4

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http://thecollectingguru.blogspot.com/2018/10/a-single-ab-test-for-stronger-core-and.html