If you saw the word “green” written on a piece of paper in red ink, and you were asked to name the color of the ink and not the word, could you do it? Would you say red? That’s just one drill instructors at LearningRx, a new facility that opened near Concord in March 2014, use to teach kids’ brains to focus. Others include counting while tapping a table or arranging shapes based on memory. It’s all part of LearningRx’s belief that our brains need workouts just as much as our muscles do, and that, in a world full of distractions, concentration is the key to success later in life.