Just as an aside to this. I can never understand walkers who wear ear pieces listening to whatever. Surely that distracts from the walk and surroundings etc. I get the impression that they will remember whatever they are listening to but not where they have been.
A friend who's training for the London Marathon asked this question of me. We've all been there, on a long tarmac section, on a Forestry Commission track with no views, where you're just plodding along to eat up the miles. How do you occupy your mind?
But even before we had the dog I have never been bored walking ...
Ah but you have SWMBO, jelly is never boring ...