As someone who's already run 900 miles and four marathons year-to-date, I'll add some hard won advice: 1) Do not be in a hurry. Most runners do way too much way too soon. You will likely get injured. You gain aerobic capacity in a matter of weeks to months. But soft tissues, tendons, ligaments, bone density... those takes years to adapt. 2) If you're getting injured, something is wrong. You're doing too much too soon…
Mostly good advice. I disagree with number 3 though. Increasing volume is much safer than increasing the intensity of the "normal" workout. For me at least, I probably did the highest mileage and was the strongest runner when I had no goal at all but was just running up the mountain because I loved it. Though I didn't race any marathons, I did so many runs of greater than that distance on my own on weekends that I've…
I can't argue with your second paragraph at all. All the mountain runners I know are beasts. :-)