She owns gold medals in the 100-meter backstroke from the 2004 and 2008 Olympic Games, in addition to several World Championships.
A former world record holder in both the long and short course 100m back, Natalie Coughlin knows a thing or two about the backstroke.
Swimmers and triathletes looking to mix up their training and work different muscle groups can benefit from turning their stroke upside down.
Click on the video below to watch Natalie give you the three essentials for a perfect backstroke.
Want to ask an Olympic swimmer a question? Visit H2O Audio's Ask Natalie page to post your question on technique, training, nutrition or whatever you'd like to ask a gold medalist.