This is so interesting to me. I practiced still meditation for a while, but to be honest I haven't in quite some time. The way you write about walking meditation seems to confirm a belief I have. I think as people we want to meditate and that it can happen very naturally. Perhaps while performing some repetitive motion at work, running, walking, and for myself fishing.

I call it the zone and it doesn't happen all the time. Most often when I'm down at the lagoon by myself and the fish aren't biting really well. I cast and retrieve, cast and retrieve, over and over until my senses change. It's crazy but I take in all of my natural surroundings from a deeper perspective and am very aware of my body. :)