I remember failing 'treading water' in swimming lessons when I was in grade 3; my first failure on paper...I was devastated :) I'm a pretty strong swimmer now, but boy the ocean currents can be rough. Brian and I had a really scary moment in Cancun a few years back; the current can change so quickly. It's difficult even for a strong swimmer. Geez, I realise I just crushed our 'relaxing' water talk haha