Start on all fours. Extend your right arm in front of you and your left leg behind, actively reaching in opposite directions.

The plank is one of the most commonly performed core-strengthening exercises, and whether you're getting your heart-rate up at Barry's or at home (using a Class FitSugar video, per chance??), there's ...

"Hearst Magazines and Yahoo may earn commission or revenue on some items through these links." That's why it pays to dedicate focused training time on your core. You can start with these ab exercises ...

This move engages your triceps, shoulders, upper back, and chest simultaneously while maintaining a solid plank position. But ...