Waking up early is the only way to go. Its too easy to blow off a run at the end of the day and a run in the morning will give you energy - hopefully the rest of the day. I run a few long distance trail runs between 50 and 100 miles every year in between kayaking and climbing. I have an early morning regiment which consists of a coffee alarm 445 am -running by 5 at work by 7 or 730 (this always works if i am in bed by 10 pm...ish) Running to or from work helps too if you live within a managble distance.
Another way to pack on miles is to do a short to medium run in the morning and another short to medium run in the afternoon or evening at faster paces. Its sometimes easier to motivate for a short quick workout twice a day than one long workout once a day. Never underestimate the power of push-ups pull ups and sit ups.
