RKC Plank

youtube.com/watch?v=c68p1KJ2n-E&list=PLHdLdhg1dGLpmmXezdk4m7PF9pSZyvEuG&index=89
Starting from the standard plank position, clench your hands together in front of you and pull your shoulders in – a kind of reverse shrug. Then tense your quads to force your knees up and really clench your glutes as hard as possible.

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