How do you stop being depressed?

Do things you enjoy and focus on the positive things. Exercise and eating healthy helps. Seeking professional help is always a good idea. Never be afraid to ask for help.

Sadness can be a difficult emotion to deal with, not only due to the pain it causes, but also because of the factors that caused the sadness in the first place. Sadness can be the result of loss, helplessness, or disappointment, among many other things. It is important to remember, though, that sadness is one of the most common and natural human emotions, and is something that will ultimately help us appreciate our happy times.
Sometimes, though, it is possible for sadness to deepen, and this may be a sign that you are suffering from a form of depression. If you feel as though you are increasingly sad, and feel like your sadness is difficult to explain, this information on depression may help.

Target heart rate is the answer