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closeup of male in forearm plank position

FitnessU: 7 ab exercises that aren’t crunches

Learn different ways to work your core muscles.
video

30 day exercise challenge–Plank tutorial

%CODE1% What is a Plank? It’s an exercise that involves an isometric contraction. Meaning, that you are holding in a position for a certain length of time. You’re contracting your muscles, primarily your abdominals, in...