1Lung Capacity Exercise: Blowing ball breathing exerciser can increase lung capacity by exercising the respiratory muscles and increasing breathing stamina. 2Educational: Let children understand gas in motion can keep light objects balanced, understand the charm of physics, and cultivate children's interests. 3Widely Use: Breathing exercise tool includes 2 foam balls, small in size and light in weight, which is suitable for home play, school use, and outdoor use. 4Bright Color: Lung capacity training tool adopted safe and environmental protection water paint color, and other parts are made of wood, not painted. 5Safe To Use: Blowing ball lung exerciser adopted 360 safe smoothly polishing, with no burrs and will not scratch your hands, which is safe for you to use.