I wasn’t sure I would be able to manage a run today; DOMS is taking a toll on my legs from all the squats yesterday. But once I got to the gym and hopped on the treadmill, I was fine for a slow 35 minute recovery run. I didn’t have my usual tracker app (its update has totally broken it) so I just put on Zombies, Run! and ran along for as long as I felt like.
When a run is hard work, it’s necessary to keep the brain engaged and focus on stride turnover, breath, and all the other pieces that have to come together. But these slow recovery runs just mean the brain goes into neutral and as long as I don’t fall off the treadmill or hurt myself everything is fine. I don’t know which kind of run I like better, but they both have their place.
Running While Fat 
It must be something in the air because I had the same exact issue
Which, brain in neutral, or broken apps? :)
The slow recovery and brain in neutral