Standing: one leg on ball with thoracic spine rotation (Balance, single-leg, with upper trunk rotation, toward lifted leg, foot on ball)

Stand with one foot resting on top of the ball with your knee and hip bent.
Ensure you are in neutral spine posture and a balanced position.
Clasp your hands in front around shoulder height.
Keeping your pelvis and low back stable, rotate with your thoracic spine and arms toward and then past the leg that is resting on the ball.
Make sure your hands stay in line with your breastbone throughout the movement.