NYTimes: Lifting Weights, Twice a Week, May Aid the Brain. Come to FitCampNYC three times a week and you may find yourself on the Mensa list! In all seriousness, resistance training, properly done has consistently improved brain function.
http://well.blogs.nytimes.com/2015/10/21/lifting-weights-twice-a-week-may-aid-the-brain/?smprod=nytcore-iphone&smid=nytcore-iphone-share