Add Yahoo as a preferred source to see more of our stories on Google. Core workouts can get old when you never break away from the back corner of the gym and the same planks, situps, and crunches. You ...

This core maneuver is much more challenging than you might expect. Here's how to do it right.

Core workouts can get old when you never break away from the back corner of the gym and the same planks, situps, and crunches. You'll have more fun (and get a much better training session) when you ...