I'm not a fan of running - that's mostly just personal taste. I respect people who run for sport, but it just isn't for me. I love to walk, especially through woods when I get the chance (not often living in an urban area, but oh well).
I also know that I spend most of my time, like it or not, sitting in a chair. Even when I'm sleeping, the most comfortable position is the fetal position, which is really still sitting in a chair (hips flexed, knees flexed) while lying in bed. I know that this means that I, like most people in our modern age, have all kinds of muscle imbalances. Short hamstrings, short psoas. Short calves from wearing heeled shoes (including running shoes/sports shoes; we don't think of them as heeled shoes but most of them place the heel a good inch or more above the toes). Weak hip, glute, and hamstring musculature (the muscles that are meant to do the weight-bearing work while upright). I have a body that's adapted for chair-sitting, because that's mostly what I do, and those adaptations don't go away when I stand up. That all predisposes me to put excess loads on my knees and lower spine, among many other things. I don't want to take this maladapted-for-being-upright body and expose it to even more force and impact through running.
I'm not saying that, therefore, no one should ever run! I know there are people who enjoy it and really get a lot out of it, and so to them, it's a worthwhile use of their time and their body. I don't, and to me, it's not. I love to work up a good sweat, doing calisthenics and such, but I know that "hard exercise" applied to the body that I have increases my risk for injury (knees and back but also internal things like wounding of the blood vessels which can lead to plaque formation), and I know that exercise doesn't actually have to be hard to be beneficial. Walking (over ground, and with work to counter those sitting adaptations) is incredibly beneficial to the body in terms of forces and loads on bones, muscles (and not just the muscles you would think! For example walking with proper gluteus activation also benefits the pelvic floor muscles overtime; walking outside and looking say, 100 feet ahead benefits the tiny muscles that work to focus the eyes), and the circulatory system. I don't mean to say that running, working to counter the same adaptations, wouldn't also have those benefits, rather that walking DOES have benefits which are often overlooked because it's "not hard enough work."