Now that he's explained what's happened here , he can't help but cry. He's not like his sister, who's gained so much weight. He wants to lose some weight, but he doesn't want to go through the motions. He tells his assistant not to look at his belly, and to sit on top of a chair. The balance ball is a popular training device that's used in street performance. It trains your core to create a strong, healthy body. The assistant tells him that this might be a little easier than he thought it would be, and that he might try some juggling while working on his core. He says he'll have to do something about his brain, though, because this is the last thing he wants to do.