I often listen to YouTube videos in the background, a la podcast, while walking my dog. It is convenient for me to do this thanks to an active subscription to YouTube Premium because without it, you can not start background playback. But if you don't want to spend money, you can always download the audio track separately.
To do this, we need the YT2MP3 service. To do this, simply go to the site and paste the link to the desired video.
After that, the service will provide several MP3 tracks to choose from. You can download them all at the same time, or just the one you need.