Windshield Wipers

How to do it:

  1. Start on your back, with your hands on the floor for support and legs lifted up off the floor.
  2. Using your core muscles to support you and protect your lower back, keep your knees over your hips as you slowly drop both knees to the right side, forming a 45-degree angle with the floor.
  3. Then, fire up your obliques as you drive your knees back to the starting position.
  4. Repeat on the other side.