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To summarize Alex's point, the idea is that sports are for getting tired. Because when you feel bad for no particular reason, rather than because you're tired, it's much worse. But, of course, if a person feels bad and is tired even without sports, then, yes, that's not an option. However, we don't know what Nebka is going through, but in my understanding, a "correct" depression is hardly caused by fatigue. If there were such simple reasons, then this condition would be relatively easier to fix (although not elementary).