Movie: 'Man Of The Year'

[Auntie]

This movie happened to have been one of John Ritter's last movies, but not quite the last one. My question is, during the ending scene of 'Man Of The Year' when John's character falls into the pool, was it a double or did he do his own stunt? The reason for this question is because, during that scene, he falls face down into the pool, so how long could he possibly hold his breath? If anyone here has seen this movie, I think you'll know the scene that I'm talking about.