Walking, like most aerobic activity, is good for your heart and lungs. It strengthens cardiovascular fitness all while toning your muscles and burning calories. Walking is low impact, so it doesn't have the same potential for injury as jogging or running. It's also a bodyweight exercise, meaning it will help improve your strength, posture, bone density and stamina. Walking aids blood circulation, lymphatic health (to rid the body of toxins and waste products) and helps regulate blood sugar.