YOU PROBABLY THINK you know how to do a plank. The ab training staple is relatively simple, after all—boiled down to the basics, all you need to do is get down on the ground and hold in place.

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Want to know what it is? (Drumrolls, please) It is boring. The lifter is not at fault here. After all, the plank makes you stare at the floor for what feels like an eternity. The strain on your core ...

Today we’re going to show you how to RKC plank, which is honestly a more worthwhile exercise than the basic, front plank. Now don’t get us wrong, the standard plank is a decent option to improve core ...