Get Washboard Abs With This 5-Minute, No-Equipment Workout

"This is a great oblique crunch!" said Erica. "Lay down on left side and keep your legs together as you reach one hand to your toes (coming up onto your elbow). It looks like you are doing a big side crunch laying down." (Note: the photo shows a V-crunch, which is a variation of this move. You'll leave your legs on the ground for Erica's mermaid crunch.)

• Lie on your right side with your left hand behind your head and your right hand on the floor.
• Press down into your right hand, bringing your torso toward your legs.
• Lower yourself back to the floor with control. This completes one rep.
• Repeat for 30 seconds, then switch sides.