AM - 7 aerobic paced miles in the morning before work.
PM - 5 miles on the treadmill. Using the HRM for the last week or so, I noticed a clear improvement - at least today - as associated with pacing at a given HR. (Same treadmill, same HR - 30 seconds per mile faster than 10 days ago). I think this may be due to the longer mileage - single runs I did for the last 10 days (as opposed to doubles per day of shorter individual mileage). This could also be due to me keeping the runs in the "aerobic" category and getting myself back into balance (ph). Or it could just be that I had a good day of running today. :)