"Hearst Magazines and Yahoo may earn commission or revenue on some items through these links." This 20-minute abs workout is part of the Women's Health 30-Day Workout Challenge. For this part of the ...

You don't need to do thousands of sit-ups or spend hours in the gym to build abs. You can instead do the bare minimum of two to three ab-focused exercises for 20 to 30 minutes a week. Exercises like ...

Add Yahoo as a preferred source to see more of our stories on Google. Unlike regular crunches, which require lifting the upper body off the ground, reverse crunches involve lifting the hips and legs ...

Why one trainer calls the plank variation "no joke." ...