Train Your Brain: 60 Days to a Better Brain is an English-language version of a Japanese book written by Ryuta Kawashima.
The original book sold over a million copies in Japan.
Dr. Kawashima found that by performing simple mathematical calculations and reading books aloud, one could retain mental clarity and stave off the mental effects of aging.
The book recommends that one should do a set of maths questions every day and note the time it takes.
A set of graphs are provided at the back of the book so that the results of the tests can be logged.