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Ditch situps right now for these three six-pack-carving moves.
Target your core like never before.
Make the most of a medicine ball and your own bodyweight.
This upper-body muscle-burner is the ultimate quick-hit circuit.
Are you making one or more of these core-training mistakes?
Use a Swiss ball and a set of dumbbells.
Challenge your body's foundational strength.
These unique exercises may not be the norm, but they work.