Honeymoon, that well known time when you take time to learn new skills like how to swim ; ) funny (or sad!) but true, with enough time on my hands and plenty of sea around me (I was in Thailand) it was finally time to find out why I could not swim more than a couple of lengths without running out of breath.
I put my mind to it and spent a good afternoon in the pool working out why I would always sink and why I could not breath properly. With some practice and lots of breaks to watch youtube videos I had managed it. For the first time in my life I could swim until my fitness was the issue and not hot long I could hold my breath!