Inclusion Criteria:  First and second year undergraduate students in Sun Yat-sen University. BMI≥22 kg/m^2. Keeping weight stable for 3 months prior to study start (weight fluctuation <5kg). Having the time and volunteering to receive the interventions.  Exclusion Criteria:  Currently engaged in other weight-loss studies. With high blood pressure, diabetes or other cardiovascular diseases. With secondary obesity induced by medicine or other diseases. Contraindication to exercise.