Steve,
1) Main trail, roundtrip, "car-to-car".
2) Basically, I never go at a pace that I couldn't carry while breathing through my nose. With few exceptions when the terrain gets too steep or I want to move through an area quickly, I won't breathe through my mouth.
I don't see how it's possible to do the Whitney main trail in 7 hours RT while only breathing through your nose (with few exceptions). That's just over 3 miles an hour on average. I'm not buying it.
Anyway thank you for your book recommendation. I did buy it and it contains a lot of useful info and I mostly train in nose-breathing pace (zone 1) now.
