Objective: The goals of this study were to (1) describe physical activity levels during school recess in 8-year-old children, (2) analyse the percentage of children who achieved physical activity recommendation at recess, and (3) examine if recess physical activity levels varied by gender, weight status, and parental educational level. Methods: In all, 291 children (mean age ± SD = 8.3 ± 0.3 years, 156 boys) from 7 schools of Granada (Spain) were recruited by convenience. To analyse sedentary time and physical activity levels during recess, children wore a tri-axial accelerometer attached to the wrist over five consecutive school days. Results: Sedentary time (29.6% vs 40%) and light physical activity (33.2% vs 35.5%) were lower in boys than in girls (all p < 0.001). Conversely, moderate physical activity (26.7% vs 20%), vigorous physical activity (10.5% vs 4.4%) and moderate-vigorous physical activity (37.2% vs 24.4%) were higher in boys than in girls (all p < 0.001). Only 12% of the children accomplished the moderate-vigorous physical activity recommendations during recess (21.2% boys vs 1.5% girls). Lower body mass index values were associated with higher vigorous physical activity intensity. Conclusions: Levels of moderate-vigorous physical activity during school recess are very low in children, being lower in girls than in boys, a very low percentage of children achieve moderate-vigorous physical activity recommendations during school recess, and girls and overweight/obese children show lower values in moderate-vigorous and vigorous physical activity.