One of the easiest and most effective methods of aerobic exercise for weight loss and and overall fitness is walking. It's easy to get started, even during the chilly autumn weather, and it puts little stress on your joints compared to many other types of aerobic exercise. Whether you're just start to take those first steps or want to hike a marathon, walking can be for you.
Learn more about walking for fitness:
http://kristensguide.com/Health/Exercise/walking_to_get_fit.asp