Hello. I just finished W9R2, so I'm on the verge of graduating! Hurray! But my 30 minute run barely makes 4k. In other words, I'm slow. I've tried to go faster during my last minute, and it's a challenge. What is the recommended strategy for picking up speed? For reference, I'm 60 years old. I'm also intruding here a little bit as I live in the US at 6000 feet in elevation. Should the thinner air impact my goals?