Why can't boxing pear-shaped balls hit hard?

1. If the pear-shaped ball is hit too hard, it will cause excessive shaking and rebound of the ball, and it will easily leave the bracket, thus causing harm to the trainer himself or others.

2. The training effect of boxing pear-shaped ball depends on its rebound degree and speed. If you hit the ball too hard, it will easily make the ball lose its balance and regularity, thus affecting the training effect.