Mindfulness is a very general term. It helps to have specific activities and just pay extra attention to doing them, while you are doing them. That's why you hear about the Zen people doing specific things like sweeping floors, shooting arrows, carrying water, and so on. Personally I'm not very athletic and I don't like to clean so I prefer just going for walks. It helps to look ahead in the distance and to look a little bit above normal eye level. Watching the ground right in front of me was a difficult habit to break.