Planking - Exercise

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https://fitness.mercola.com/sites/fitness/archive/2014/12/05/5-plank-benefits.aspx


https://www.indiatimes.com/health/healthyliving/7-surprising-benefits-of-doing-the-plank-exercise-everyday-324035.html


The American Council on Exercise
https://www.acefitness.org/education-and-resources/lifestyle/exercise-library/32/front-plank

https://www.acefitness.org/education-and-resources/professional/prosource/february-2014/3680/reality-check-are-planks-really-the-best-core-exercise


http://www.oprah.com/health/plank-variations-for-a-strong-core



There is standing plank also


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https://www.uwhealth.org/uw-carbone-cancer-center/core-strengthening-plank-position/13967






http://www.guinnessworldrecords.com/world-records/longest-time-in-an-abdominal-plank-position