I didn't really need a device to tell we were walking more than usual. My legs, ankles, and even the bottoms of my feet hurt. I'm very happy that we started early retirement ten years ago. It's not an exaggeration to say that one should travel while one's still physically capable.
So today, other than putter around the yard, I did little. I walked less than three kilometers! There are always plants to check. For example, Jay harvested my handful of tiny, little greenish tangerines from a tree in the yard. He had to knock them down with a stick with a homemade hook on the end.