What Would Ryan Do?

If this isn't incentive to work your abs...

Incorporate the plank (pictured here) into your exercise routine to not only tighten your core and flatten your stomach, but also to build endurance in your back and stabilizer muscles.

To set up lie face down on a mat with your forearms on the floor. Lift up your hips and legs to create one straight line with your body. Suck your bellybutton in and keep the whole body charged up. Aim to hold for 1 minute.