Who is down!? Get your core up! 30 Day Plank Challenge. Wh…

Who is down!? Get your core up! 30 Day Plank Challenge. Wh…

I Did a 2-Minute Plank Every Day for 30 Days — Here's What Happened., by Fitnessrecharge

This 30-Day Plank Challenge Will Transform Your Core in 4 Weeks

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30 Day Plank Challenge For Beginners

I did a plank every day for a month and here's what happened to my running

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