Levels of activity and enjoyment were measured in 73 Hong Kong primary school children (39 girls and 34 boys), during regularly scheduled physical education (PE) classes. Classroom activities were classified into one of 4 types (ball games, athletics, gymnastics and free play). Activity levels were monitored by heart rate telemetry and by direct observation (CARS), whilst enjoyment was scored using a 5-point Likert scale. Results showed that the average PE class used 22 minutes of the scheduled 35 class time, whilst the students spent 3.7 min in moderate-to-vigorous (MVPA) activity (60-90%HRR), and nearly 50% of the children spent less than 2 minutes with their heart rate above 159 beats · min−1. There were no significant differences in activity levels between genders. Ball games and free play generally produced statistically higher heart rates and CARS values than gymnastics. The levels of enjoyment were low (3.7 − 1.0), but did not vary significantly between gender or activity type. A variety of social and environmental factors may contribute to these low activity and enjoyment levels.