Note: No, you're not crazy. The audio is crap in this video. I selected the correct microphone, but it still managed to screw up. Sorry about that. Don't panic! Your moneyed friend wants you to participate in a 5K with him? No problem! Charity and her assistants will make sure you finish in beautiful, sparkly style!
To listen while using other apps, switch the player to Picture-in-Picture (PiP) during playback — it keeps playing in a small floating window (the screen stays on).
To listen with the screen fully off, in-browser playback stops by YouTube's design. Open the video in the YouTube app to keep listening where background playback is supported (e.g. with YouTube Premium).
Open in YouTube app