Positive thoughts = Negative splits. I saw this on the back of a guy's race t-shirt while waiting in line to get on a ride at Disney World a couple years ago. I thought it was a perfect saying for runners. Negative splits for runners is when you run each increment of your run (I go by miles) at a faster pace than the previous. In other words, if you run a 9:00 on your first mile, an 8:30 on your second, and an 8:00 on your third, than you had negative splits. When I run I tend to get stronger every mile. I have heard people say the opposite, that they get slower because they get tired. Part of it is physical. You have to train yourself to get stronger physically. But by keeping your thoughts positive you give yourself a better chance of getting stronger with each mile. Instead of thinking "I'm too tired, I can't do this" you need to remind yourself that "I'm strong, I can do this" You...