Anyone know any good breathing techniques (books, videos, ect.) for labor and delivery? Especially, during delivery. With my first, I had a difficult time catching my breath while pushing (it felt like I couldn't get enough air into my lungs) and wanted to try and be more comfortable this time around.

I'm thinking it was mostly the position I delivered in which was the typical hospital back position. Which is most likely how I'm going to be delivering this time around.