research shows that regular exercise reduces symptoms of moderate depression and enhances psychological fitness. exercise can even produce changes in certain chemical levels in the body which can have an effect on the psychological state. endorphins are hormones in the brain associated with a happy positive feeling. a low level of endorphins is associated with depression. during exercise plasma levels of this substance increase. this may help to ease symptoms of depression. a national health and nutrition survey found that physically active people were half as likely to be depressed. exercise also boosts the neurotransmitter serotonin in the brain. neurotransmitters are chemicals that send specific messages from one brain cell to another. though only a small percentage of all serotonin is located in the brain this neurotransmitter is thought to play a key role in keeping your mood calm.
how can exercise affect my mood?