I don't have a degree in fitness or anything, but everything I've ever read on the topic indicates that walking is a perfectly satisfactory aerobic activity. Now, mind you, strolling along at the pace you do at the mall isn't going to do you a *whole* lot of good, but if you walk briskly for a good amount of time, and you do it consistently, you're going to see benefits, especially if you're combining it with a reasonable diet.
Eventually, you might get to a point where you want to try something more strenuous, and your body will be able to handle it. But in the meantime, it makes sense to me to stick with a form of exercise that doesn't wreck you and that you enjoy enough to keep doing it - which is really the point anyway!
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