Turns out that if you never train your body to be still, it’s pretty damn challenging to do. But more than that, many experts argue that fidgeting has an underlying biological explanation regarding your cognitive functioning. As Huff Post reports, Karen Pine, a professor of psychology at the University of Hertfordshire, suggests that “the same brain areas are involved in both movement and speech,” which explains why “we move the hands more when we are trying to find a word during a tip-of-the-tongue moment.”