So instead of use it or lose it, perhaps a better saying to keep in mind is what is good for the heart or body is also good for the mind. If you want to learn more, an interesting overview of research...

So instead of use it or lose it, perhaps a better saying to keep in mind is what is good for the heart or body is also good for the mind. If you want to learn more, an interesting overview of research related to exercise and brain health can be found in the book, Spark: The Revolutionary New Science of Exercise and the Brain, by John Ratey and Eric Hagerman (2008).