Several studies have confirmed the effects on humans. AFIK, this one was the first: https://scholar.google.com/scholar_lookup?title=Neurogenesis+in+the+adult+hu

Several studies have confirmed the effects on humans. AFIK, this one was the first: https://scholar.google.com/scholar_lookup?title=Neurogenesis+in+the+adult+human+hippocampus&author=P.+S.+Eriksson&author=E.+Perfilieva&author=T.+Björk-Eriksson+et+al.&publication_year=1998 https://scholar.google.com/scholar_lookup?title=Neurogenesis... If you google for studies citing the one above, you will find many more. Purely from a standpoint of scientific evidence, running if one of the best things you can do for your brain. Bilingualism and cognitively demand work are also a good ideathough its less clear whether they have cognitive protective effects or actually lead to neurogenesis.