Whether you walk or jog, it's important that you keep moving. When you stop moving and lead a very sedentary lifestyle, that's when you give your body the signal to shut down and eventually all the problems associated with a sedentary lifestyle start.
To get any kind of cardiovascular benefits from walking or jogging, you need to walk briskly, or job at a moderate speed. Moderate to vigorous momentum is key to all the HEALTH benefits. For added muscle tone, strength training is the answer.