I walk my dogs twice a day, virtually every day. They whine if I don't. But I can only do it because I work from home. When I worked long hours in an office, I spent much less time inside. It was usually dark when I was not at work. If you're working during almost all daylight hours, you're not going to be able to take walks.

However: Walking is not something that's ever helped me in any noticeable way. It doesn't help my mood or help me sleep or anything else. It's pleasant when the weather is nice, but the weather is very often not nice at all. When sweat is pouring down my body, I hate walking. When the cold is hurting every bit of exposed skin, I hate walking.