The New Rules of Abs
Master these seven static floor exercises.
The basic plank—toes and forearms on the floor, shoulder blades pulled and down, butt down, body straight—is harder than you might realize. But once you can hold it for 60 to 90 seconds with ease, move on to a more challenging version of the classic. (The exercises are organized in ascending order of difficulty.) Do them in front of a mirror so that you can monitor your form, and be sure to break when it goes off.
Plank with Arm and Opposite Leg Raised
Start by holding a plank and raising just a leg, then try raising just an arm. To finish the progression, try both one arm and the opposite leg. If you can hold both for 90 seconds while keeping your body straight, you're stronger than Lou Schuler.