Hundreds of sit-ups aren’t the key to building a strong and injury-resistant core. Yes, this abs exercise is great at strengthening just that — your abs — but in the abs vs core muscles debate, it’s ...

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As a fitness editor and marathon runner, I’m here to tell you that sit-ups aren’t the way to build a rock-solid core. As a mom, I know this for a fact, as it’s taken me months to rebuild my midsection ...