I agree with both parent comments. The reason walking around is a good source of ideas is basically mindfulness/Zen/whatever you want to call it - put your bra

I agree with both parent comments. The reason walking around is a good source of ideas is basically mindfulness/Zen/whatever you want to call it - put your brain in a bath of non-problem stimuli and stop verbalising your thoughts, and you can actually hear your brain generating new ideas. Of course it doesn't mean you'll get something useful straight away, or even in an hour, but you'll get new spontaneous thoughts and that's a good start. This is why, when you do take a break, it is essential not to occupy your "doing" mind - by reading HN/twitter or playing Skyrim, my weaknesses - and just relax.