"Hearst Magazines and Yahoo may earn commission or revenue on some items through these links." I love working out, and a good workout challenge is even better. When I had the opportunity to try model ...

Sports Illustrated’ swimsuit mode Penny Lane flaunts her award-winning bikini body and famously chiseled abs in a workout ...

The fun thing about ab workouts is that there's so much you can do to challenge and strengthen your core with zero equipment necessary. Take this 10-minute workout shared by Swedish Australian ...

Gale started with crunches to strengthen her core. She then opted for arm and leg raises to further the burn. Gale also relied on knee-to-elbow crunches and twists. Her workout buddy relaxed and ...

A strong core is about more than just six-pack bragging rights — it’s the foundation of your strength and overall well-being. But you don't need to torture yourself with endless crunches. Instead, ...

Core workouts are the perfect place to start if you’re a beginner starting a new fitness routine, because building a stronger core is a great foundation for everything else you might go on to do with ...

In case you didn't already know, adding weights to your workouts is a sure-fire way to up the intensity and reach all kinds of goals, whether you're trying to get stronger, lose weight, or even boost ...

Looking for a quick ab workout to fire up your core? This seven-minute intense ab challenge targets your lower abs with no equipment. To find out for myself, I unrolled my yoga mat and gave it a go ...