Cuban boxers have always punched above their weight in the world arena: the little island has clocked up no fewer than 63 Olympic medals - 32 of them gold - in the last 40 years. Enjoying extraordinary access to the mysteries of the Havana Boxing Academy, this emotional documentary follows the fortunes of three ten-year-old lads over eight months as they submit to a punishing regimen of training for the National Boxing Championship. But, as with the best sports films, Sons of Cuba is about more than winning or losing. It's about more, even, than boxing itself.