Hi everyone

I've started practicing waterpolo in september. I would like to improve cardio and endurance because I got tired too easily. I need to be able to stay in the pool for at least 10 minutes in a row (even more) doing sudden turns, accelerations etc

Do you have any ideas about some training I could do in order to improve cardio and endurance? Let's say twice a week

Thanks a lot (I hope my English is good enough)