I don't know how many of you guys and gals train alone but I would say that for most of the week, running alone is a fact of life, with the week-ends for running with your buddies. Most of your mileage should be mid-week, if you are trying to get your long run in at the week-end you have wasted your mid-week training opportunities.At the W/E you can blaze a trail or two and kick up the intensity or take a break from your high, easy mileage, and enjoy the company.Don't rely on the those two days for you mileage, get them in mid-week.