You may have done bicycle crunches countless times without knowing they're an oblique exercise. Focus on rotating your rib cage (not just your elbows) to make sure you're really engaging those muscles.
- Lie face-up on the floor with your legs extended and fingers interlaced behind your head. Pressing your lower back into the ground, draw both knees in toward your chest and lift your shoulder blades off the ground.
- Straighten your right leg so it's hovering just above the floor while turning your upper body to the left, bringing your right elbow toward your left knee. Make sure your rib cage is moving and not just your elbows.
- Repeat on the opposite side: extend your left leg, draw your right knee in, and reach your left elbow toward your right knee.
- That's one rep.
