Daily exercise can have a huge impact on how positive we feel.  There are several reasons why.  First, giving our body a regular workout helps reduce tension and stress.  Second, studies hae shown the exercise changes our body's biochemistry.  During exercise we produce natural opiates, known as endorphins, that make us feel happier -- hence the famous "runner's high."

Finally, regular exercise reduces fat, improves muscle tone, clears the skin, and makes us feel strong.  These changes often lead to a significant increase in self-esteem.