Grog, I feel your pain. Well sorta... my knee has been acting up and it irritates the hell out of me and makes me push harder. I know I should rest it but I am training for a half in Feb as well and don't want to lose any days. I also have a cold. I wore running shoes today for the first time in a month and I hated it, and I think it made the knee worse. My times certainly weren't any better (4.18 miles in 43 minutes, a few hills but gawd...) Back to scuba booties tomorrow.