the weather was so decent, temperature-wise, that I expected this to be a great run. It turns out that the humidity is very high and despite the run being slow it made me very sweaty and unpleasant in general.
I almost bailed early, because of the humidity and the 50 pound weights it felt like had lodged in my left leg.. but decided not to. That is one of the key things I have learned - you don't just give up. Not every run will be great, but as long as you are not risking injury, just make yourself keep going.
I ended up running an 8km recovery run, at a slow pace. This slow pace was my average pace just a few weeks ago, so that makes me happy.