When it comes to doing exercises to strengthen your core, planking is a popular choice. The problem is, it's kind of...dull. To entertain yourself while you're holding plank position, you can crank up ...

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All products featured here are independently selected by our editors and writers. If you buy something through links on our site, Mashable may earn an affiliate commission. The Stealth Core Trainer is ...

I don’t know about you, but strengthening your core without weights sounds like an efficient way to fit ab work into your ...