Wow, I literally hated everything about that run...everything felt difficult and my body just did not want to respond for some reason! I felt like I was doing high effort but going at a snail's pace, it was so hard! There were plenty of times that I wanted to give up and walk especially during the last half of the run. I kept on looking down at my watch willing it to finally say 4K, and got annoyed when it had said that I had only done 3 and a bit. The last hundred meters were so painful! I've done an 8K before and I was going at a fast-ish pace and it felt fine. But today I did half that distance and it was horrible!
BUT I still did it and that's what matters! Hopefully my 3K run on Monday won't feel as difficult...