Observation bias. Those who succeed to drive themselves to do an effort, are already out of the depression. Try doing 7hrs sports a week and falling into depression: You won’t have the energy. It’s not sports that gets you out of depression, but sure it’s a stage on the way back and you gotta constantly give it a chance.
This is spot on. "To stop being sick you just have to do all the stuff healthy people do, and not do the stuff sick people do! I have never seen a healthy person being sick, so it must work!".
