Tested neg again. I'm going to keep every-other-day testing up to hopefully be sure I don't have a Paxlovid rebound event.
Very easy run, trying to stay in what Garmin thinks my "Easy" HR range is (I have no idea what it's basing this on- maybe my max recorded thus far?), so 127 and below. Felt ok, had a few coughing fits which sent HR higher.