I find it good to learn songs while walking, getting a verse down and gradually adding more. It also lets me set a desired pace and comfortable key for the song and gives you plenty of time to choose what to emphasise and doesn't make me a slave to the version I learned from, while enabling me to check back to my original sources to brush up on things without wanting to go back to singing it in the source's key which may have been uncomfortable for me. I'll still have my own way of things down pat in my head and can make needed adjustments or readjustments. Luckily, I have a nearby lake to walk around, pausing when I pass other people.......