THE BLUE STAGE WILL ONLY BE ACCEPTING STUDENTS AGED 3yrs – 5yrs, please ensure you book the correct class. About the course The Blue Stage (age 3 - 5) The Blue Stage introduces children to tennis through games and fun activities. Children learn the basics of tennis including how to rally using lots of adapted equipment such as balloons, big balls, and beanbags. Court size: variable Tennis ball: red ball (25% compression) Recommended racquet size: 19-21 inches