Carrie Underwood's trainer's at-home ab workout is so quick you can complete it during a commercial break. Here's how to do the three exercises using an ottoman in the comfort of your living room.

Russian twists are a popular ab exercise for working the oblique muscles on the sides of the body. But common mistakes, like going too fast or using too much weight, can make the exercise less ...

Think of all the stretching exercises you know. Most people can name—or at least picture—some leg, arm and shoulder stretches, but how many abs stretches can you name? I would have struggled to name ...