Kneel in front of a stability ball with your knees hip-width apart, then place your forearms on the ball, hands in loose fists (a). Keeping your back flat, brace your core and slowly roll the ball away from you by straightening your arms; extend as far as you can without allowing your hips to drop (b). Pause, then bend your elbows to roll the ball back to start. Repeat eight to 10 times.
2000 Lbs. Static Strength Stability Ball with Pump | $14.99 USD | Perfect for planking and a good item to rotate with a desk chair + kneeling chair + standing desk to rebuild strength and posture without tiring any single muscle group. Bending over was a serious process when I started using this, so the foot-operated pump was an unexpected and enormous perk.