I was worried about that--the altitude. It's already hard for me as it is to run (I'm improving tho) but I can't imagine how hard it is going to be for me up there. I'm worried I'm going to be one of those people who throw up. Do you have any tips so I can prepare myself for that altitude?
I agree with
@wildblueyonder. The best thing you can do is focus on running consistently and improving. If you push yourself to run further/longer than is comfortable, you will improve. Find a 5k training plan and follow it if you need a set routine to slowly ramp up. Most of them start with very little running, so you can just start wherever you're at, even if that is just walking fast with a little bit of jogging.
Also, there is nothing wrong with throwing up. There is a reason there are trash cans strategically placed around the track when running inside (and if I remember right, around the T'zo when running in the mornings during basic. I'm pretty sure I threw up after every PFT I took, and a large portion of the AFTs and runs in basic, it happens when you push yourself to your limits.