Prone alternate arm-leg lift (Core stabilization, lifting opposite arm and leg, prone; 04)

Lie on your front with your head in a neutral position.
Extend your arms straight out in front of you.
Simultaneously lift one arm and the opposite leg, clenching your buttock muscles and your abdominal muscles to maintain stability in your body.
Keep a neutral alignment with your head throughout the movement.
Lower the arm and leg together, then repeat with the other pair.