Britta Steffen in action
Cesar Cielo in action
Britta Steffen from Germany holds the woman's world record at 52.07 seconds, and Cesar Cielo from Brazil holds the long-course record with a time of 46.91 seconds
The world records in swimming are ratified by the international governing body of swimming FINA. Records can be set in long course (50 metres) or short course (25 metres) swimming pools.