Jeff Galloway is a real advocate of limiting the number of consecutive days run, especially as you get older.
From the Training Programs book
35 and under: no more than 5 days a week
35-45 no more than 4 days a week
46-59 every other day
60+ 3 days a week
70+ 2 longer run days and 1 walk day
80+ o longer run/walk, one shorter run/walk and one very easy short walk
Particularly once you are over 40 he feels adding a low mileage day will increase your risk of injury---he'd suggest increasing the mileage on the run days rather than increase the number of days you run. He even goes as far as discussing running twice a day. He really likes those recovery days.
| Pounds lost: 6.5