@apropos And yes, I obviously get the positive feedback loop principle, but the thing is, that people always start with Gym, Job and porn.
First two things are an incredible motivation sink, and most likely 1/2 of the reason the person feels like shit in the first place. And the 3rd is a replacement for something he would be much happier, if he could be doing instead.
So, why are people always focusing on these 3 points, when they are the worst starting point? He's screaming, because his will to live is at 0.
Do you want a good help at 0? Call your parents. Do it daily. Call other old friends, and try to find at least one person you can talk to daily.
Then, cleaning up. Your surrounding has an insane levels of effect on your mind, even when you don't see it.
And then, the hardest part. Find a way to meet new people. Good fucking luck with that point though, since people seriously do whatever is in their power to make this step impossible. But this is the point, that is breaking people's minds.
Once they can meet people, gym or job are no longer a pointless motivation sink, and a person can start healing.