Upper Body Flexion Rolling
I use upper body flexion rolling as a proxy for testing inner core timing. It also is the fundamental pattern of flexion, rotation, and single leg balance.
For upper body rolling both arms overhead and then bring your one arm so it's at a 90 degree angle and you're going to roll, keeping your legs perfectly still. So you are not moving from the waist down. Turn your neck and rotate slowly coming over. And come back. What you can see is how the legs just come over nice and easy with the rotation.If you feel like you're getting stuck midway through, do a good belly breath at that point in time.