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No, not sit-ups — try the runner's plank to strengthen your abs without hurting your lower back
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 ...
Keep your back straight and hold the plank for 30 seconds, then rest for 30 seconds. Repeat four times. We may earn commission from links on this page, but we only recommend products we back.
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