Are there any scientific studies to back the common meme of "Fitness is a cornerstone of success" The ways exercise benefits the brain was discussed on HN befo

Are there any scientific studies to back the common meme of "Fitness is a cornerstone of success" The ways exercise benefits the brain was discussed on HN before multiple times. http://news.ycombinator.com/item?id=3620529 http://news.ycombinator.com/item?id=3620529 How Exercise Fuels the Brain (well.blogs.nytimes.com) http://news.ycombinator.com/item?id=3047554 http://news.ycombinator.com/item?id=3047554 How Exercise Can Strengthen the Brain (well.blogs.nytimes.com) A search for 'exercise brain' returns many more results. Now it's up to 'is improving your brain function cornerstone to success?'