Moderate-intensity aerobic exercise can help some teens with depression, a new study published Monday in the journal Psychological Medicine revealed. UPI reports that researchers found that those who completed three 45-minute treadmill workouts per week for eight weeks saw a 55 percent average drop in their depression symptoms. Study participants who did light stretching three times per week saw a 31 percent reduction. "Our findings add to the existing and growing body of evidence supporting aerobic exercise as an effective antidepressant treatment," researcher Brandon L. Alderman told UPI. "The findings from our study suggest that it may be possible to identify individuals who would benefit most from exercise in terms of depression reduction," Alderman said.