Yes, all of that
Exercise can increase the release of endorphins and reduce levels of cortisol (a stress hormone (called that because stress triggers its release as part of the "fight or flight" response), which can also increase fat accumulation around the waist area, so two reasons not to have chronically high levels of it. Very good and helpful and necessary in small amounts and in times of stress (burst of energy, lower pain, etc.), but not all the time because of the strain on the body). It can help you feel a bit better when you are gloomy.
And also agree on the depression thing. I think the
word "depression" is overused, but not the condition itself. People that say "I'm so depressed today" when they have a bad day but are not normally that way are misusing the word, and in that case, it might be easier to stop feeling bad by doing other things. Probably not a chemical imbalance condition in that case.
But the actual condition of depression is not so easily dealt with. It's a terrible and potentially life-destroying condition that can ruin you. People that have never experienced clinical depression don't really know, since it is so much different than just "feeling bad". It can alter your thoughts, make you think your life is awful and there is no hope, even when to a non-depressed person, this may seem like a silly thought. You aren't thinking right when you are depressed. Depression comes in cycles, different for each person. It can only happen once in your life, or it can be recurring. It will generally resolve by itself, but without treatment it may take months to years, and even then it will probably come back again. Hence medicine. If you don't truly have depression, the medicine will either do nothing for you, or cause other problems. It's tricky.
I can tell you...don't even wish true depression on your worst enemy. It's terrible...and terrifying, really, especially when you think about what you almost did or were thinking about when your mind clears again. Nyaa :no: