High school runner;Had to take 9 months off for injury. Cross trained 5 days a week for 45 min(some more of a workout than others). Had my first run back today and couldn't even run four miles without breathing like I just ran 400s after only running 2 miles. Legs hurt as well. How long till I'm at least able to run 6 miles comfortably?-only ran 2 yrs prior doing 45 maybe a little more miles per week and 2 workouts/racing