Follow these 4 simple rules on how to work your lower abs. Don't get stuck with a 4 pack abs, instead work on getting the full washboard. Want core strength, six-pack abs, and a healthy spine?

And along the way, you’ll build those six-pack abs, too. HOW TO DO IT: An underrated plank upgrade, this move challenges your abs and obliques (and your glutes, too!). Start in pushup position ...

To get abs, you need to lower your body fat percentage by eating healthy and doing cardio. To get a six-pack, you'll need to build your abs with exercises like Russian twists and leg lowers.