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> physical exercise is one of the only things that uncontroversially helps prevent depression.

You clearly never had to deal with a case of clinical depression.

I have experienced clinical depression and physical activity was absolutely 100% a critical part of both recovery and maintaining mental health. Most (but not all) people that I know who have experienced clinical depression have had similar experiences.

And just to clarify: prevention is different from treatment (the context was treatment).

But most importantly, for clinical cases, physical exercise and similar won't do anything; just imagine a typical case of child abuse.

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