Today I had a hard tempo run at 6:49/mile for four miles. It sounds like a good pace (goal was 6:50), but I was really strugling toward the end, so I'm wondering if it was really so beneficial. I'm not sure what's going on with me, maybe it is just colder than ideal and this is close to the limits of my abilities. I'll definitely just try to keep up this pace for this distance for the rest of the pre-plan training.