correlation is not causation, but

I started going to the gym for a variety of reasons. Along with feeling better physically, I found that I slept a lot better and was generally more content. And then I skipped a week of exercise. I lost sleep, got depressed and anxious, and felt like life was spiraling out of control. I went to the gym today and did very light exercise and it's as if all the bad effects are completely reversed. Note to self: go to the gym regularly.