Do you need to make a change?

When anything you do becomes second nature, you need to make a change. The basic principles of brain fitness consists of variety and curiosity. If you can do a puzzle with your eyes closed or have a particular skill that becomes extremely easy then it's time for a new challenge so that your brain can have a real workout. You require curiosity about the world around you, how it is working and how you comprehend it. When you learn a new skill; your memory comes into play.