This video features small plastic tubes. I started out using four of these little tubes, but it didn't work out so well, so then I switched to handling just three. Two of them are empty shampoo & conditioner bottles. (Don't worry; they went into the recycle bin right after I finished the video.) The other two are full lotion tubes.
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