This Barry's Bootcamp-inspired HIIT ab workout take only 15 minutes to sculpt your core—all 360 degrees of obliques and more.

With any cardio exercise, 150 minutes a week is a great baseline, so you can break that up however you want. Dancing for about 30 minutes a day, five days a week, is optimal. It's also a good idea to ...

So when I had the opportunity to review the Women's Health Flex Challenge Abs Enthusiast track firsthand, I was immediately game. (The Flex Challenge is a customizable 28-day workout challenge ...

Join Class Fitsugar trainer Natalie White for a challenging HIIT core workout that's over and done with in just 10 minutes. All you need is a mat!

Usually the three-week mark is around the time I start to get a little bored with a challenge. Thankfully, the rest of me was ...

Jennifer Nied did trainer Jenna de León's 7-minute dumbbell abs workout every day as part of the 28-day challenge. There are her before-and-after results.

The Ultimate Ab Workout To feel long and lean in no time, do the following moves twice through (or three times if you're feeling frisky), four to five times per week, along with 15 to 20 minutes ...

I recently tried the Chloe Ting ab workout challenge with more than 420 million views on YouTube, and, let me warn you now, my core still hasn’t forgiven me.