Moods, say the experts, are emotions that tend to become fixed,influencing one's outlook for hours, days or even weeks.(1)____________________________________.Perhaps one of the best ways to deal with such moods is to talk them out:sometimes, though, there is no one to listen. Modern science offers an abundance of drugs.But scientists have also discovered the effectiveness of several non-drug approaches to make you loose from an unwanted mood. (2)____________________________________.So the next time you feel out of sorts,don't head for the drug store—try the following approach.Of all the mood-altering self-help techniques,physical exercise seems to be the most efficient cure for a bad mood.“If you could keep up the exercise, you'd be in high spirits,” says Kathryn Lance,author of Running for Health and Beauty.There is obviously a link between physical activity and mood changes.Researchers have explained biochemical and various other changes that make exercise compare favorably to drugs as a mood-raiser.Physical exertion such as housework, however, does little,probably because it is not intensive enough, and people usually do it unwillingly.(3)___________________________________________.Do them for at least 20 minutes a session three to five times a week.