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26 Mar 07

In fact, the brain uses about 25 percent of the oxygen that you take in
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>. Because exercise creates endorphins, people who exercise regularly have more energy, feel alert and have an increased sense of well-being and better memory retention.

It's possible that running, cycling and other sports may trigger a primal "flight or fight" response in us, and in doing so, may spur brain cell growth, much as it did in ancient hunters as they chased their prey or were chased by predators. Or it could just be that getting more blood to the brain is good for us.

19 Mar 07

As you walk, pressure changes in body cavities due to rhythmic skeletal motion and contractions of muscles. The diaphragm is your primary breathing muscle and contracts rhythmically with the abdominal muscles to aid respiration, as well as to stabilize the body. The result of diaphragmatic contraction is a massage for your internal organs. The increased respiratory demand that occurs from muscle actions during walking keeps the internal organs mobile and healthy.
Because much of your immune system travels through your body via blood and lymphatic fluids, improving your circulation through daily walking can improve immune function, as well as your metabolism and general health.

Increased metabolism means more than simply burning calories, it means that your body will be more likely to draw in nutrients from your food and supplements.