As others have mentioned, hydration becomes critical at higher altitudes.<br><br>
I don't really think getting acclimated for just a couple days will make that much of a difference. If you had a week or two, that would help a lot.<br><br>
One thing you can't control, is altitude affects different runners very differently. I spent some time training in Mammoth Lakes, where we lived around 7,000 ft I think, and did some training runs maybe up to 9,000 ft. I honestly didn't notice the altitude at all. When we dropped to low altitude for an interval workout, I actually felt worse. But I know of some elite athletes who simply can't function at all at altitude and have no choice but remain at sea level. Fortunately, those cases are the minority. Most people notice it, but it isn't a big problem. If you are lucky, you will be one of those ones who doesn't even notice the difference.
I don't really think getting acclimated for just a couple days will make that much of a difference. If you had a week or two, that would help a lot.<br><br>
One thing you can't control, is altitude affects different runners very differently. I spent some time training in Mammoth Lakes, where we lived around 7,000 ft I think, and did some training runs maybe up to 9,000 ft. I honestly didn't notice the altitude at all. When we dropped to low altitude for an interval workout, I actually felt worse. But I know of some elite athletes who simply can't function at all at altitude and have no choice but remain at sea level. Fortunately, those cases are the minority. Most people notice it, but it isn't a big problem. If you are lucky, you will be one of those ones who doesn't even notice the difference.