I love running, I'm addicted to it. I got some of my best ideas while I was running. Ideas for apps, ideas for university papers back when I was studying, and much more. For a time, I used to listen to ebooks but that didn't work at all because my mind would always wander off and think about new ideas, so usually after 5min of running I'd completely stopped listening to the ebook voice.

I also prefer music without voice (like minimal house) or with lyrics that are barely existent or not understandable gibberish.

Oftentimes I don't use music at all though, simply enjoying the sounds of nature.

It's a really good diversion to being a single startup founder and hacking all day.