This may indeed be the smoothest freestyle stroke in the world. But why don't you decide by checking out the video above. According to the video description:
"Now this really is efficient (and fast) swimming! Watch Olympian Jono Van Hazel's near perfect stroke just before your next swim and reproduce his smooth movements when you jump in the water: a very powerful way to improve your swimming.
Notice that while Jono has a very long freestyle stroke he doesn't achieve this by gliding (a very common misconception amongst swimmers). Instead he has low drag and fantastic propulsive technique which gives him great distance per stroke."
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