Whether you’re trying to tone up for beach season or simply to improve your core strength, a solid ab workout routine is essential. Although you can do core exercises with little more than a mat, many ...

Beth Skwarecki is Lifehacker’s Senior Health Editor, and holds certifications as a personal trainer and weightlifting coach. She has been writing about health for over 10 years. Machines are one of ...

Women's Health may earn commission from the links on this page, but we only feature products we believe in. Why Trust Us? That said, different ab machines function in very different ways, so it's ...