Many times people who exercise report feeling good after a workout. You get a feeling of satisfaction and your feel energized which leads to a more positive outlook on life. Exercise also promotes feelings of relaxation and stress reduction, alertness and improved ability to concentrate and focus, all leading to a positive mood.
Personally I believe this is what lead me to my fitness lifestyle. I would leave the gym less irritable. Exercise has been shown to be effective at reducing stress and can lead to immediate and long time results. For people who exercise as a way of dealing with stress it is a good idea to exercise during the day that is most beneficial. An early-morning workout might prepare someone for the days stressors.
Many people report having better sleep when they exercise regularly. Typical improvement include falling asleep more quickly, longer periods of deep sleep, and feeling more refreshed in the mornings. Outdoor exercise is beneficial because it also provides light therapy, adding extra sleep benefits.
Reduces Depression and Anxiety
Regular exercise is associated with reductions in anxiety and depression. Anxiety refers to feelings of worry, self-doubt, fear, and uncertainty. Exercise appears to be associated with improved mood in people who have depression. Research has shown that regular exercise has the greatest impact on depression and is comparable in effectiveness to psychological therapy and medication for mild to moderate depression.