So many New Year's resolutions focus on exercising the body, but this app of the day will help you with a different goal, exercising your mind. Lumosity is an app that was developed by several psychologists and neuroscience experts. You start by telling the app your goals like, thinking faster or improving your memory. The app then provides you with daily exercises to help train your brain. Each daily session is about 15 minutes long, and after about a week you will start notice a difference. Lumosity is free to download and it is available on your computer and iPhone.