Options for mild or moderate depression.  Exercise, psychotherapy, and relaxation techniques are good first choices.
D001676:Biofeedback, Psychology / Q000379:methods; D003863:Depression / Q000517:prevention & control* / Q000534:rehabilitation; D015444:Exercise; D007722:Health Knowledge, Attitudes, Practice; D006801:Humans; D019222:Mind-Body Relations, Metaphysical; D011613:Psychotherapy; D011788:Quality of Life; D012064:Relaxation Therapy / Q000379:methods*; D020377:Self Efficacy; D014481:United States