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Walking is great exercise and can be very beneficial aerobically. Aerobic exercise is defined as brisk physical activity that requires the heart and lungs to work harder to meet the body's increased oxygen demand. In other words, it's moving your body to get your heart and lungs to work a little harder.
A Jonathan Penney , Fitness, answered on behalf of National Academy of Sports Medicine. Starting a walking program is excellent, congrats to you! Now that you have started exercising you need to start eating right! We want to focus on eating well all the time and not just before or after walking.