Watch full movie online. The Havana Boxing Academy is a Cuban boarding school that takes 9-year-old boys, and turns them into the best boxers in the world. SONS OF CUBA follows the stories of three young hopefuls through 8 dramatic months of training and schooling as they prepare for the biggest event of their lives so far: Cuba's National Boxing Championship for Under-12's. But during the season, crisis strikes: Fidel Castro is taken ill, and all of Cuba's Olympic boxing champions defect to the USA, leaving Cuba at a crossroads, and the boys contemplating a changing world.