Everything you need to know about Olympic Marathon Swimming.
A 10km race in open-water, this is another adventure sport. It entered the Olympic Games at Beijing 2008.
Watch more Marathon Swimming: http://bit.ly/2a0pV44
Everything you need to know about Olympic Marathon Swimming.
A 10km race in open-water, this is another adventure sport. It entered the Olympic Games at Beijing 2008.
Watch more Marathon Swimming: http://bit.ly/2a0pV44