You watch helplessly as Nate walks toward the transforming water polo team. You know this isn't a good idea, but you saw the glint in Nate's eye. He wanted to 'play' with the new balloons down there, and nothing would dissuade him.
At first you don't notice what's starts happening to Nate, you think it's just the light and his inflatable body, but watching closer you notice that Nate is in fact inflating with each step! "Nate!" You shout, but he just waves a hand without even turning around. He's completely oblivious to his inflating body. Each step swells him another inch in diameter. Nate quickly becomes chubby, then fat, and soon he's waddling with a giant belly.
Nate finally notices, but it's too late. His body inflates outward ever more. His arms and legs swell into large pudgy balloons and soon Nate cannot bend them. He loses his balance and falls lightly on his belly, bouncing a couple of times. He's becoming very light.
Nate is almost completely round, except for bulges for his head, arms and legs.