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As a former cross country runner & current (bad) triathlete:
I'm a huge fan of running on turf (or dirt ... anything that's not concrete). It's a better workout for the ankles & shins anyway, and wards off most joint problems. All I ever do, if I can help it.
For breathing: An old coach of mine always had us measure our breaths based on something we were doing, i.e. runners breathe based on foot count, swimmers on stroke count, bikers on pedal count. I tend to start breathing in for four steps, out for three, reducing steps as the heart gets going.
Maximum for me is in two steps, out two steps. If you find you need more air -- like near a finish line -- in two, out one is OK, but any less starts to throw my rhythm off.
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