I'm a big fan of 'Zombies, Run!', created by the same creators as 'The Walk', so this was very much my thing. It's pleasingly weird, going to some interesting sci-fi places I wasn't expecting a fitness app aimed at the mainstream to go. That said, it's best played as the app, not listened to as a podcast, although the story is interesting enough that it stands on its own. It would be good to have a sequel!