Health behavior can be something that is done once, or something that is done periodically—like getting immunizations or a flu shot. It can also be something that one does only to oneself, such as putting on sunscreen, or a behavior that affects others, like putting up a shade cover so that children at a playground are protected from the sun. Other health behaviors are actions that are performed over a long period of time, such as eating a healthful diet, getting regular physical activity