Thank you! I watched a podcast episode with Rick Rubin and Andrew Huberman and they did a breathing exercise at the beginning with an app like this. Rick Rubin

Thank you! I watched a podcast episode with Rick Rubin and Andrew Huberman and they did a breathing exercise at the beginning with an app like this. Rick Rubin never mentioned the name of the app and when I tried to search the app store for something like this it was all freemium junk. I got so annoyed I was about to make my own damn app, but now I don't have to.