In addition to working out for the first time in 30 some years I have decided to cut out the unhealthy snacks and sugars just to trim up some fat and flab and watch my numbers since I’m going on 55 now.
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