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RKC plank: How to do it perfectly to build stronger arms and core

If you are looking for a real challenge, then try doing the RKC Plank. Invented by a former Soviet special forces trainer, ...
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Move Over, Sit Ups – the Reverse Plank Variation Is the Easiest Way To Challenge Your Core, Legs and Arms

Love them or hate them, planks are undoubtedly an elite move when it comes to strengthening your whole body. If you've been to any kind of strength-based class in the last, oh, decade or so - you'll ...