I go for a long walk every day, with my main motivation being staying in shape for mountain stream native brook trout fishing, which often requires long walks, often over rough terrain, with large elevation changes. At least to get to some of the streams I want to fish.
If hunting is the main thing you enjoy outdoors, then that can be your motivator.
Try to find places to walk nearby, close to where you live and where you work that you enjoy. So, the walk itself is something that you look forward to, not some "chore" to be done.
Close to where I live there is a walking path that goes along the stream. I love walking there. Even though it is close to town, it is outdoorsy enough that it's really enjoyable.
There are many walking/biking paths around, and many parks. And in many places there are residential neighborhoods where it is easy to walk.