A rubber elastic ball, you can step on the boards on both sides of the ball with your feet, and you can jump when you clamp it. Who can tell me what it's called?
Balance fitness ball. Question: This is a small ball that can be stepped on. A: Commonly known as "bouncy ball" or "bouncy ball". On both sides of the ball, practice bouncing. Mainly used to exercise legs and buttocks, so that buttocks and thighs are more beautiful, more suitable for women with large buttocks and thick thighs. Now many shopping websites can buy it.