Exercise can be an effective treatment option for adolescents diagnosed with depression and in particular help with symptoms of depression such as fatigue and anger.
I Hughes CW, Barnes S, Barnes C, DeFina LF, Nakonezny P, Emslie GJ. Depressed Adolescents Treated with Exercise (DATE): A pilot randomized controlled trial to test feasibility and establish preliminary effect sizes. Mental health and physical activity. 2013 Jun 1;6(2):119-31.