Inclusion Criteria:

• Schizophrenia spectrum disorders;
• Aged from 18 to 65.
• Chinese-speaking (to enable cognitive testing).
• Ability to understand the nature of the study and to give informed consent.
• Fewer than 10 hours of physical exercise in the previous 3 months.

Exclusion Criteria:

• Severe physical illness (Myocardial Infarction, Hypertension, Fracture, Spinal problems in which exercise with mild-to-moderate intensity may be contraindicated).
• Comorbid diagnoses of organic brain syndrome, substance misuse, history of epilepsy or seizure, intellectual disability, significant head trauma, active suicidal ideation or self-harm behaviors.
• Known pregnancy, or other contraindication to tDCS or MRI (e.g., have a cardiac/heart pacemaker, brain aneurysm clips, any implanted metallic or electrical device, or any internal metal foreign objects).