Ask your brain to do math every day, and it gets better at math. Ask your brain to worry, and it gets better at worrying. Ask your brain to concentrate, and it gets better at concentrating. Not only does your brain find these things easier, but it actually remodels itself based on what you ask it to do. Some parts of the brain grow denser, packing in more and more gray matter like a muscle bulking up from exercise. For example, adults who learn how to juggle develop more gray matter in regions of the brain that track moving objects. Areas of the brain can also grow more connected to each other, so they can share information more quickly. For example, adults who play memory games for twenty-five minutes a day develop greater connectivity between brain regions important for attention and memory.
The Willpower Instinct: How Self-Control Works, Why It Matters, and What You Can Do To Get More of It