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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.
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Ditch sit-ups — this 5-move abs workout builds core strength and improves your posture in just 10 minutes

I don't think I'm alone in saying sit-ups aren't fun. I don't know if it's because I need to have someone or something there to make sure my feet stay put on the ground during the full movement or ...