Walking is so much better with an mp3 player. Yes, it does require a small investment initially but it is worth every penny! You don’t have to listen to only music while walking, you can also engross yourself in audio books or podcasts and just eat up the miles.
You can even make a point to listen to an audiobook while walking. The anticipation of finding out what happens next will be enough motivation to go out for a walk.
The same old route can get a bit dreary.
Explore a new route every now and then. If the environment is enjoyable, miles just fly by.
By focusing on your surroundings you may even forget that you’re exercising.