Prior to the intervention, body height and mass were measured for BMI (kg · m–2) calculation. Age-referenced cut-off values of BMI were used to identify overweight and lean children (range of cut-off values for 9.0–10.5-year-old males: 19.10–20.20; for co-aged females: 19.07–20.29; Cole, Bellizzi, Flegal, & Dietz, 2000). Twenty-six of the seventy students (37.1%) were classified as overweight. Children’s aerobic fitness was determined by their performance on an aerobic fitness field test (20 m shuttle run test, Léger & Lambert, 1982) described in the Physical assessment paragraph. Children whose estimated VO2max fell above the 70th percentile (n = 12,VO2max = 49.64 ± 1.74 mL · kg−1 · min−1) or below the 30th percentile (n = 14, VO2max = 36.74 ± 2.55 mL · kg−1 · min−1) were considered as higher-fit and lowerfit, respectively, according to age-referenced aerobic fitness norms