Just finished 3 miles on the treadmill. Okay, I've decided to run at a slightly slower pace than I did last year given that my HR has been a wee bit elevated thanks to my thyroid. It's working like a charm, and I've been able to run without stopping. So I'm not going to break any speed (or distance) records, but mentally, it's more satisfying than stopping every mile or so to let my HR come down a bit.