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Ditch sit-ups! This 10-minute dumbbell workout builds a rock-solid core and perfects your posture

While sit-ups and crunches might be seen as the cornerstone of ab and core workouts, they’re far from the only moves that get results. Plenty of other exercises take you off the mat and onto your feet ...
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Still doing sit-ups? This one core exercise builds stronger abs without hurting your spine

If sit-ups leave your back sore or your results stuck, this smarter core move could change everything.