a good breathing technique for running the longer distances is to breathe out for twice as long as you breathe in, and try and keep it steady for the whole run after the first 5 mins when you are just settling in to your rhythm anyway. I personally breath in for 3 strides and breathe out for six, using mouth and nose to breathe. see what works for you, you might have to use 2 and 4 strides. Its like anything you do, swimming press-ups and sit-ups etc when you and doing something repetitively, you can always do it better and more comfortably when your breathing is settled and the supply of oxygen to your lungs is constant and steady.
