Fitness, but not physical activity, is related to functional integrity of brain networks associated with aging. - Michelle W. Voss; Timothy B. Weng; Agnieszka Z. Burzynska; Chelsea N. Wong; Gillian E. Cooke; Rachel Clark; Jason Fanning; Elizabeth Awick; Neha P. Gothe; Erin A. Olson; Edward McAuley; Arthur F. Kramer (NeuroImage, 2016)