First off, I SUCK at running. My sprint tri's are great until the run. I have tried to work on it and went yesterday to get new shoes. The Brooks I had were pretty blown out and I always felt like daffy duck in them. Well turns out they were too big on the ball area of my foot (side to side) and I had been really not improving. Well came home with a new rockin set of Asics in a narrower width that fit perfectly. Went out with my husband and did four miles including sprint (pant, pant) intervals. I actually feel like there's hope . What a difference a properly fitting pair of shoes makes.