What kind of exercise will lift your mood?

While regular exercise may be as effective for mild or moderate depression as antidepressants, there is a big catch, one that triathlete Peatick has figured out: It has to be intense, for at least 30 minutes, according to Madhukar Trivedi, MD, professor of psychiatry and head of the Mood Disorders Research Program and Clinic at University of Texas Southwestern Medical Center in Dallas. He has authored several studies that show regular exercise can reduce depressive symptoms—in one case by up to 47%.