Probably not. Unless you're walking "vigorously", which most people tend not to do when they're just trying to get from A to B.
The good news is that it is very easy to add some form of exercise into your life. You don't have to become a gym rat, the key is to find a hobby that you actually enjoy and that involves some physical activity: hiking, skiing, surfing, join a local soccer league, etc. I highly recommend Brazilian Jiu Jitsu. It's like playing chess with your body; raw athleticism, strength, and speed are always defeated by intelligence and technique. It's also great stress relief.
The good news is that it is very easy to add some form of exercise into your life. You don't have to become a gym rat, the key is to find a hobby that you actually enjoy and that involves some physical activity: hiking, skiing, surfing, join a local soccer league, etc. I highly recommend Brazilian Jiu Jitsu. It's like playing chess with your body; raw athleticism, strength, and speed are always defeated by intelligence and technique. It's also great stress relief.