Begin on your back with your legs straight and your arms extended overhead.
Actively press your lower back into the floor, and draw your belly button into your spine.
Inhale to slowly lift your arms and legs off the floor. Keep your hands and heels as low to the ground as possible, while still pressing your lower back into the floor.
Simultaneously lift your arms and legs a few more inches toward the ceiling without lifting your shoulders (you're not reaching your hands to your feet like in a V-up), then lower back to your hollow position.
This is a pulsing motion, and you should maintain tight abs the entire time.