Hmmmm....I have a small one...she's 7 and pretty damned strong.
I would think after 20 of them, I would be running out of gas. I know that 3 minutes of boxing is pretty damned taxing. Even 5 minutes hitting a speed bag and heavy bag is difficult. Having to knock out that many little people would be hard.
I'm not sure why I responded to this post. Kind of a sick premise....LOL.