Ab Wheel Rollout from the Spine

This version of the rollout will resemble a crunch more than a plank. During this movement, think about three things:

Setup: Position yourself in a full kneeling position with your knees about hip-width apart for lateral stability. Round out your upper back and tuck your tailbone in. Squeeze the glutes. Lock your arms and hips in place before you start.

Maintain Stability in Your Pelvis: Make sure that the movement being created is coming from your spine and not from your hips.

The Movement Itself: Start by shifting your body forward as one unit and allow your spine to straighten out until you reach your full range of motion, which can be different for everyone. Once you've reached your full range of motion, contract from your abs and allow the flexion from your back to pull you back towards the starting position. Avoid pulling your hips back. – Pieter Van Der Linde