When you're depressed your energy levels can drop drastically, but the last thing you want to do when feeling down is to keep yourself from getting up. It's a physiological fact that activity fights depression. Get your heart rate up 20 minutes a day, five days a week, and it has been scientifically proven that you will feel better emotionally. Exercising increases the neuro-plasticity of your brain and releases neurochemicals called endorphins, which help to elevate your mood. Even just getting out of the house for a walk, a game of catch with your kids, or a trip to the gym is a medically proven method of improving the way you feel.