How to Increase Mileage Without Burning Out?

These are things you should pay attention to so you have the best chance of an injury free, successful transition:

•    Increase gradually (5 miles a week)
•    Instead of running 10 miles each day, split it into 5 in the morning and 3 in the afternoon, three times a week.
•    Once your reach 40, alternate a high week and low week (i.e. 40, 45, 40, 50, 45, 50, 45, 50.)
•    The key to the transition was a day off every week so your body could purely adapt and recover. 
•    As you build mileage, do static stretching (1min holds) on major muscle groups, including IT band, after every run.
•    Mileage won’t make you burn out; neglecting proper recovery will.  The more you run, the more you need to adjust your lifestyle (sleep, healthy food, recovery runs, days off, etc) so that your energy remains balanced.