It looks fairly likely that I'll be off to Colorado in January for a few days and I'll be wanting to do some running whilst I'm out there.
I hope to get a hilly run in the foothills of the Rockies, so around 8000-10000', but I've never run above 2000' before.
I should say that I'll probably be there 3 or 4 days before attempting a run like that, but I may do some short early morning runs on the roads as soon as I arrive, and that will be at about 6000'
So, what do I need to know?