I walk around my block almost every day. Sometimes I miss a day, but I'm pretty religious about it. It's 0.9 miles around my block – some of it downhill, some of it uphill -- and it takes me about fifteen minutes. Not too long to disrupt much of anything, but long enough for me to consider it "exercise."
I go out of my driveway and turn right. It's immediately downhill, so it's an easy warm-up. I pass my neighbors' houses. I have an interesting mix of neighbors: doctors and lawyers, journalists and retirees, new people and some people who have been here since the 1950s. More than a few work at the nearby Jet Propulsion Laboratory, a federally funded research and development center and NASA field center. Quite simply, I live in a town full of rocket scientists.