How to do Cross Crunch
1- Lie on a mat with your knees bent, your feet flat, and your fingers against the sides of your head.
2- Engaging your core, raise your elbows and upper back slightly off the floor, twisting your torso to your left so that your left elbow moves toward your right knee.
3- Hold for a moment then lower your upper body slowly to the floor, using your core to control the movement.
Cross Crunch Benefits
This simple but effective core exercise works your obliques and abdominis, building both rotational strength and the ability of your core to stabilize your spine and hips against external rotational forces.