In John Medina’s first rule he speaks about exercise. The brain can be trained in numerous ways, exercise is one of them. Exercise should be a huge part of our lives as it increases blood flow to our brain but also increases our cognitive skills. He also speaks about the difference in someone who’s brain has been properly exercised and another who’s brain has been poorly exercised. Just through showing the differences in these two caught my interest. A brain that is exercised, can show significant improvement in ones ability to do difficult tasks. In all, this book The Brain Rules has caught my attention, I look forward to reading the rest of this book.