Lumosity is a start-up site that challenges your mental ability...help train your brain to increase reaction time and memory. Word sorts, shape matching, patterns, and many more exercises are just what you need if you believe some of the new scientific research that shows that we can improve the health and function of our brains with the right mental workouts. Silly you....you thought you only had to exercise to keep that cheesecake off your hips! Who knew the brain needed exercise TOO, right? ENJOY.