How to Get a 6-Pack: Best Workout for Abs

Give sit-ups a break and try a plank, Harvard Medical School physicians say. It'll help strengthen your entire core and avoid injury to your back. Here's how to do it correctly.

How to Get a 6-Pack: Best Workout for Abs

How to Get a 6-Pack: Best Workout for Abs

Here's How 30 Days Of Doing 100 Situps Changed This Guy's, 51% OFF