Slowly roll your chest over the ball to end with your hands leaning on the floor and your trunk fixed on the top of the ball.
Your arms are perpendicular to the floor a little wider than shoulder width. Your palms point naturally forward and your elbows are straight. Firm up your body core, bring your pelvis to a neutral position and fix your shoulder blades.
From the starting position, walk with your hands, alternate putting your hands forward while slowly rolling your body and legs over the ball. Keep your body core fixed all the time and do not bend at the waist. Only your legs stay leaning on the ball until you get to your toe tips. Walk your hands back in the same way without changing the spine curvature. Breathe evenly and pay attention to keeping your body core firm throughout the entire movement.
Keep your body core firm, do not bend at the waist and keep your pelvis in a neutral position.
Pay attention to fixing your shoulder blades to the chest spine.
Keep your wrists naturally straight and do note twist them laterally.
In the beginning you can exercise with just your lower trunk leaning on the ball.