Gym ball exercises are the underrated Pilates alternative. They challenge the core, shoulders, arms, and back in a similar way and use a versatile fitness essential. I love a Pilates workout at home.

There are so many effective ways to work your core at the gym and at the home. You could grab a kettlebell and do a full-body routine with sneaky abs engagement, do bodyweight abs moves like plank ...

We'd never strong-arm you, but there are so many benefits to adding a medicine ball to your workout. (Getty Images) I'll admit it: For years, I avoided adding a medicine ball to my workouts. Frankly, ...

While exercises like sit-ups and crunches work the rectus abdominis, or "six-pack" muscles, this simple-looking exercise ...

Add Yahoo as a preferred source to see more of our stories on Google. The best ab workouts aren't just for those seeking chiseled physiques. Athletes of all sports—from baseball to football to ...

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Strengthening your core is about more than losing weight or getting defined muscles. A strong core can improve the way the rest of the body works and help balance and stability. Working out the ...

There are many great exercises for increasing your core strength. One of the best is the Russian Twist. Learn how to perform ...

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. Do you want a strong ...