Lacking Motivation

I have been feeling so blah lately. My body feels tired. My mind feels tired. I just don't want to run. I only managed to get in one run last week and that's only because I forced myself. Everyday I justified that I would run the next day...I would make it up later. Now I am onto the next week (my weeks start on Tuesdays) and I should run but I just don't want to. I want to watch tv and relax. There are less than 40days left until the marathon. My long runs are ramping up - I'm supposed to complete a 29km run this sunday. I thought I would start getting excited, you know get into this running thing, but no I feel quite the opposite. Maybe it's just that winter is coming and I always get down and feel this way in winter - but really it's just the end of September, am I to feel this blah until April? No wonder I always gain back the weight over these months....