I've just printed out a schedule for 16 weeks to prepare for the Air Force Marathon Sep 20th. The schedule seems to be a little light on distance though I see a steady progression on the long runs. Could this be because I stated that I currently run 21-25 miles per week? The schedule only provides for running on Sun/T/Th with the off days for rest and XT. I thought I needed at least 4 days and a little more milage. Any other resource to compare?