The author compares this to cross fit, an approach to fitness where routine is the enemy! So, on top of all the other advantages of speaking more than one language - it can keep you fitter, for longer! I like that thought!
When you think about it, only a few countries have only one language, so being at least bilingual is the norm for most.
Check out some more advantages here.
found here
New York Times article on bilingualism from 2012