For exercise, I walk with audiobooks. They're great for this. Figured out 30 years ago that I can't think independent thoughts with one of those going, though.

For exercise, I walk with audiobooks. They're great for this. Figured out 30 years ago that I can't think independent thoughts with one of those going, though. For thinking, I walk with nothing. If I want to remember something, I'll do something out of the ordinary as a reminder (e.g., transfer my keys or phone to a different pocket, or pick up a pebble and carry it) and write it down at the end of the walk. Notebooks seem to chase ideas away.