Last week, NPR ran a story about the connection between movement, thinking and ADHD. Teachers who wrote in following the article, didn't need a study to tell them what they already knew- students who have problems concentrating respond well to having acceptable ways to fidget. Through comments, tweets and emails, educators gave examples of solutions they have offered students, which won't distract those around them.
Find their suggestions at NPR: What Do You Do With A Student Who Fidgets? : NPR Ed : NPR