Monday workouts are always the same. Use Monday as a day of compative rest. Run an easy 3 miles, then adjourn to the gym for 15-30 minutes of strength training.
Rest is important for recovery after the weekend's workouts.
Friday is also a day of rest. In between, you get to do some good running, including speedwork on Wednesdays. Your toughest training occurs on the weekends. So begin this Monday with an easy 3-miler, contemplating while you run the training ahead of you. Over the next half dozen weeks, you will progressively add a mile to your Tuesday workouts every week until you are running 6 miles in Week 7.