Did some kind of sort of speed work/hill training. There is a hill I use for 1/4 mile hill intervals which is part of a loop. The hill is a little more than 1/4 mile. I did 6 repeats where I'd run fast, then talk a 1 minute jog, and then go again. The first 4 I had trouble going fast and they felt really hard. Eventually they didn't feel as hard and I was going faster. Only did 6 so I know eventually they would've gotten back to being hard and slowing down. Should try for 10.
Was originally going to do 5x1k. Will try that again soon.