This 30-Day Plank Challenge Will Strengthen Your Entire Core
30-Day Plank Challenge
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I did the plank challenge for 30 days with realistic results - YouTube
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30-Day Plank Challenge
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30 Day Plank Challenge Chart
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January 30 Day Plank-A-Day Challenge | 30 day plank, Plank challenge, 30 day plank challenge
MyNavy HR - In just four short months Sailors will need to master the plank for the PRT. Earlier today we shared tips on how to plank, now let's tackle it together