Image 5 Lumosity games target core thinking skills. Spot the bird before it vanishes while remembering the letter (top) to train your focus. Compare the word on the left with the color on the right (middle) to stretch your cognitive flexibility. Type the answers before the drops hit the water (bottom) to tune your problem-solving ability. THIS IS A PREVIEW. or subscribe to access the full article. Already have an account? Sign In COURTESY OF LUMOSITY.COM calisthenics-for-a-childs-mind_5.jpg THIS IS A PREVIEW. or subscribe to access the full article. Already have an account? Sign In ADVERTISEMENT Scientific American is a trademark of Scientific American, Inc., used with permission © 2015 Scientific American, a Division of Nature America, Inc. All Rights Reserved.