 You need to learn a skill specific for the backstroke as when you swim backstroke, sometimes waves might come into your face, right? So you don't need to stop at that moment, you just need to learn how to exhale from your sinus from your nose. So if not, the waves go on your face, the water goes inside your nose and then it's painful, it's something that nobody likes. So when that happens, just sneeze with your nose in the water. When you know how to do it here, you can learn how to do it on the back. If you do it when I'm looking at the sky, the water don't go inside my sinus. I'm fine. I blow from my nose. If you don't, the water goes inside and ah, it would be not something you will enjoy. You try again, take a big breath and sneeze from your sinus. So this is a very important skill when you swim backstroke. Every time you feel waves coming toward your face, sneeze from your nose. Otherwise you practice.