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Studies suggest that it can.
The walkers experienced half as many colds as the control group. The walkers also showed an increase in natural killer cells, immune system cells that attack bacteria and viruses. Another study of employee fitness programs showed that people who exercised as little as once a week averaged nearly five fewer sick days annually than those who did not participate in such programs. You may have heard that intense physical training can decrease the immune system. But daily walks in the healthy heart zone and fat burning zone , with a walk or two a week at higher heart rates, will not put you over into the suppressive category.