Anonymous wrote:For the most part - you should be breathing normally. Once you stop breathing to hold a pose it gets tiring. If you are breathing loudly then you are pushing yourself too hard. This isn't no-pain no-gain. This is do-it at your body's pace and the results will come. The guys that do it gracefully did it a for a long time. Its like trying to bench 300lbs because you saw everyone else do it on your first day.
No.
In many styles of yoga you are supposed to breathe audibly and are coached to do Ujjayi breath, as others have mentioned.
It's not moaning but that varies by instructor too, I've had a couple encouraging moans. Most encourage deep sighs and exhales at the beginning or end. Some places encourage doing your own pose and dance moves or "whatever your body is calling for". Most don't but it's interesting if someone takes them up on it.