Do you ever feel like you're having a great workout, but then you hit a wall and all of a sudden it's really really hard? On Saturday I was doing my weekly long run, and it was going fine, up until about mile 12. As soon as I passed that marker, my body just kind of said 'nope, no more, I'm done'. The last 4 miles of the run (I ended up finishing the 16) were super hard. At first I was really upset about it, like I started thinking how am I going to finish 26 miles if my body gives out after 12? But then the more I thought about it, I realized I hadn't slept well the night before, so I was tired to begin with, I didn't eat as well on Friday as I usually do the day before a long run, and I didn't take any of those energy gels that I'm supposed to be using. So now I feel a little better about it, and hopefully next time won't be so tough!