True, everyone can walk but they don't think about it being 1. easy and 2. satisfying. I recently started walking to places near my work at lunch. Seriously, for three years I would drive across the street to the sandwich shop. I walked once (it is a walk under a freeway, so not a residential street) and won't look back. Even when it was 100 degrees and humid, I felt energize from a 5-10 minute walk. If I lived a mile from work I would walk so I could be full o' pep all day.