It feels pretty weird to me that people are almost programmed to recommend Therapy or Gym as the ultimate solutions.
Despite the fact that not all people are capable of doing both.
Further more, there is no study, as far as my knowledge go, that show any ultimate cure for depression. Matter of fact I had seen a study that suggest a very high percentage of people are drug treatment resistant (meaning that there depression would not get better with any prescribed drugs).
I had seen studies that say that training or even just daily walks can highly improve mood, but I had never heard that they fully cure depression.
Your premise is wrong. People recommend all kinds of things, including those two. But you didn’t tell us the backstory. Maybe you’re trying to suggest that many people have told these things to you, and if so, we would want to know the context. It’s quite possible that you’ve described your own situation in a way where those two ideas are obvious potential steps to try.
I’m also unclear what you mean about people not being capable of therapy. They might not be able to afford it, but that’s not a question of their capacity. Certainly it’s true that various types of therapy can be more or less effective for various people depending on a ton of factors. But it is peculiar to rule out therapy as something that’s totally impossible without any explanation of how or why.