Keep your back straight and hold the plank for 30 seconds, then rest for 30 seconds. Repeat four times. We may earn commission from links on this page, but we only recommend products we back.
But once you master it, according to Men’s Health US fitness director Ebenezer Samuel, C.S.C.S., and fitness editor Brett Williams, N.A.S.M., the Copenhagen plank will provide plenty of core-crushing ...
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