YO-BALL is a fun aid to help children practice abdominal breathing, using simple paper card assembly, with beats so that children can exhale training in the way of counter-beating, and by passing the ball through the challenge of paper cards, from low difficulty to high difficulty, and let children practice at the same time deep and long exhalation exercises, a fun way to train lung capacity, and with a buoy tester and a record for parents, YO-BALL is a product that does not require the use of electricity, so children can practice at any time.
