It always sounds so simple. An activity as basic as walking can help with so many health issues, from losing weight to lowering one’s risk of heart problems. If the nation gets moving, even just 20 minutes a day, we’d find ourselves feeling stronger, more energized, and less prone to disease. So why doesn’t everyone do it? For some major cities, it might be because the neighborhoods just aren’t “walkable” enough. Josh Herst founded Walk Score to put some data behind the idea of walkability, so now cities can evaluate how much they’re doing to help encourage citizens to get into a walking routine. Now, top cities like New York, San Francisco, and Boston can show off their walking cultures, and car-dependent cities–like Nashville, Jacksonville, and Charlotte–have the opportunity to review in-depth analysis of the walking cities’ success stories.