Explanation:

1. Move your body into the prone position (on hands and toes);
2. Tighten your abdomen;
3. Keep your back in a neutral position through the pelvic tilt;
4. Bend your right knee in a controlled effort to the left arm;
5. Move your leg back to the starting position;
6. Then move your left knee towards your right arm in a controlled effort;
7. Alternate this movement each time at a walking pace.