Memory exercises are today’s mental weights; accordingly, numerous online programs are available to help people strengthen working memory, one of the mental systems responsible for storing and manipulating information. Working-memory training originated in 1999, when cognitive neuroscientist Torkel Klingberg created a computer program designed to help children with ADHD learn to focus. By 2001, he launched his company, Cogmed, and initial studies of children with attention deficit problems were promising.