Inclusion Criteria:  Aged above 18 years Ethnic Chinese Overweight (BMI ≥23 for Asian) Centrally obese according to IDF and NCEP with Asian-specific cut-off (waist circumference ≥90 cm for males; ≥80 cm for females) Males and females  Exclusion Criteria:  Medical and somatic conditions that prevent brisk walking Chronic diseases affecting mobility and motor function (e.g., neurological disease, musculoskeletal disorder, spinal cord injury, autoimmune, arthritis, Parkinson's Disease) Chronic diseases affecting cardiorespiratory and metabolic health (e.g., cancers, cardio-/cerebrovascular diseases, heart disease, diabetes mellitus, pneumonia, chronic pulmonary diseases, nephritis, nephrosis) Signs of cardiac arrhythmia indicated by aberrant electrocardiography during incremental VO2max test Regular moderate-to-vigorous intensity exercise (≥150 min weekly) in the past 3 months, as screened by a specially designed questionnaire Daily smoking habit Excess alcohol consumption (daily ≥30g for men, ≥20g for women) in the past six months Claustrophobia Surgery, therapy or medication for obesity or weight loss in the past six months (e.g., gastric bypass, gastric band, sleeve gastrectomy, gastric reduction duodenal switch, and dietitian-prescribed dietary program)