Yesterday (Sunday), I ran 20 miles. It was probably the toughest training run I've ever done. This made no sense to me since I've done 20+ miles several times, and did 18 without much problem the weekend before. At mile 14, I was much more tired than I was at mile 18 the weekend before. I generally do an out and back route - run 10 miles north on the trail, turn around and run home. This was really beneficial to me this weekend because I may have just given up at mile 15 if I wasn't 5 miles form home...only one way to go the last 5 miles and that was to continue running.
At mile 16, I did something I very rarely do while running - I stopped and stretched for about 5 minutes - not because I had a cramp, but because I was tired, mentally drained, and needed a few minutes to rest and regroup mentally.
So, as I struggled through the final miles I started thinking (and over analyzing as I tend to do) - what did I do differently this week than in the past. I actually made most of my mid-week training runs, that was different than many weeks this year, but that couldn't be it. I was wearing newer shoes, but that generally helps my long runs go smoother. Then I realized that this year I didn't eat like a runner the week before the run. One of the main reasons I run is so I can eat food that I like. However, eating unhealthy the 3 nights leading up to a 20 mile run - not a good idea! High carb/low fat is the only way to go when a long run is on the weekend agenda. So I've re-learned a lesson I learned the hard way when training for my first marathon - don't try to run if you haven't given your body the fuel it needs to do so. It's sort of like pouring oil into your gas tank and trying to start your car - yes, oil is one component of gasoline, but they are clearly different products (sort of like pasta with red sauce is totally different than deep dish pizza with red sauce on top:-)
Get out there and run.....