I don't have any problems with the breathing but I have done Pilates before and it is somewhat similar. It makes a lot of sense to me because your lungs are in your back and it is the area that is most responsible for the breath. When you inhale and pull in your stomach you automatically pull the breath into the back lungs. This will really strength the lungs and your overall engery levels. It helps if you stand in front of a mirror and watch your back expand instead of your chest.
