This exercise helps improve core stability. It’s important to try to keep the hips equally aligned, the back in line with the leg and arm and not wobble! Head and neck should also be aligned with the back not looking up or down. Mine I’ve noticed is slightly too raised.
Tryig to keep body line as straight as possible, engaging core and glutes. Can’t hold for long as lack of strength in damaged shoulder rotator cuff which is still being treeated by physio to strengthen surrounding support muscles. Its taking a long time.