Here's a pretty decent 30 day plank challenge I did recently. https://www.menshealth.com/fitness/a35856218/30-day-plank-challenge/
It starts off pretty easy, but ends up quite difficult.
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Here's a pretty decent 30 day plank challenge I did recently. https://www.menshealth.com/fitness/a35856218/30-day-plank-challenge/
It starts off pretty easy, but ends up quite difficult.