This is a tool designed to test flexibility. It is easy to use—simply bend backward, tilt your head back to maintain balance, and walk forward. The two vertical rods are made of iron pipes and are marked with numbers from top to bottom. The higher the number, the greater the difficulty. There is a half-circle notch where a plastic horizontal bar can be placed. The design ensures that the bar can be securely positioned inside. If it is impacted, the bar will fall off, ensuring the safety of children. Children need to walk or cross over by walking backward and tilting their bodies. The higher the number they pass while walking backward, the greater the difficulty. Conversely, when crossing over, a lower number indicates a higher difficulty level.
