Inclusion Criteria:  There are two or more Diagnostic and Statistical Manual of Mental Disorder (DSM)-5 depressive symptoms, including at least one core symptom. Any of the core symptoms of subclinical depressive syndrome lasts at least one week, with symptom manifestation ≥50% of the time. CES-DC ≥16 points, Altman Self-Rated Mania Scale (ASRM) < 13 points. 10~17 years old.  Exclusion Criteria:  Current or past DSM-5 criteria for major depressive disorder,Bipolar disorder, Schizophrenia. With moderate or above suicide risk determined by Columbia-Suicide Severity Rating Scale (C-SSRS) (who will be referred to psychologist and/or psychiatrist for follow-up intervention) Musculoskeletal problems such as arthritis, gout, osteoporosis, or back, hip or knee pain that may interfere with exercising A history of organic brain disease or brain trauma Alcohol, drug or other psychoactive substance abuse or dependence Currently enrolled in another exercise study Any condition that would make exercise unsafe or unwise Taking medication that interferes with heart rate response to exercise such as beta blockers