Bicycle Crunches

You can do regular crunches all day long, but that gets pretty boring for you and your abs. Bicycle crunches are a great way to target the rectus abdominis and the obliques in one easy exercise. Speed is not the name of the game here; go slowly to focus on your form and your breathing.
Six-pack, here you come!

• Lie flat on the floor with your
  lower back pressed to the ground.
• Put your hands behind your head, then bring your knees in towards your chest and lift your shoulder blades off the ground.
• Straighten your right leg out to about a 45-degree angle to the ground while turning your upper body to the left, bringing your right elbow towards the left knee.
• Now switch sides and do the same motion on the other side to complete one rep.