28. “Spiderman” Plank Crunch
Simply holding a plank crunch (often called a “Spiderman” crunch) challenges your core, legs, and chest just by virtue of stabilizing your body. Bringing each knee to an elbow will tax your obliques and core, and bringing them back to the starting position forces your chest, shoulders, and arms to compensate for the weight shift. Combine this move with a pushup to make it even tougher.
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