Long-term voluntary wheel running is rewarding and produces plasticity in the mesolimbic reward pathway.
Greenwood BN, Foley TE, Le TV, Strong PV, Loughridge AB, Day HE, Fleshner M. Long-term voluntary wheel running is rewarding and produces plasticity in the mesolimbic reward pathway. Behav Brain Res. 2011 Mar 01; 217(2):354-62.