Backstroke

Swimming style in which one swims on one's back

Backstroke or back crawl is one of the four swimming styles used in competitive events regulated by FINA, and the only one of these styles swum on the back. This swimming style has the advantage of easy breathing, but the disadvantage of swimmers not being able to see where they are going. It also has a different start from the other three competition swimming styles.

From Wikipedia, under CC BY-SA. More on occurri.