Cognition: Due to sensitivity of the Eriksen's flanker task performance to changes in aerobic fitness status [Colcombe et al. 2004;Kluding et al. 2011], we chose change in Percent Increase Score (PIS) on flanker task as the primary cognitive outcome measure. Participants were asked to identify the orientation of a central arrow cue ('<' or '>'), which was flanked on both sides by two arrow cues that either pointed in the same direction (congruent: <<<<<) or a different direction (incongruent: >><>>). Using reaction times (RT) during congruent and incongruent trials, the PIS was calculated as =((RT_incongruent - RT_congruent) / RT_congruent) * 100.[Colcombe, Kramer, Erickson, Scalf, McAuley, Cohen, Webb, Jerome, Marquez, and Elavsky2004] The Stroop test was used as another measure of inhibition.