4.Excercise. Everyone knows you should exercise, so I’m not going to belabor this point. But it really does make you happier, both in the moment of exercise (I’m exerting myself, I’m alive!) and throughout the rest of the day. Exercise lightly, if you’re not in the habit yet, and just for a few minutes a day to start out. Who doesn’t have a few minutes a day? If you don’t, you need to loosen up your schedule a bit.