“…Possible explanations for the antidepressant effect associated with activity include immediate‐to‐short‐term and longer‐term physiological mechanisms (e.g. increased synthesis of norepinephrine and serotonin, increased blood circulation, Buckworth, Dishman, O'Connor, & Tomporowski, ; increased synthesis of endorphins, dopamine, and endocannabinoids, Ekkekakis, ; neuroimmune modulation, i.e. reduced inflammation and oxidation stress, Eyre & Baune, ; enhanced energy and lower fatigue, Loy, O'Connor, & Dishman, ; circadian rhythm reset through natural light exposure, Stephenson, Schroder, Bertschy, & Bourgin, ) as well as psychological mechanisms (e.g.…”