Depends on a person's opinion. I would say swimming though.
In my opinion the hardest sport to learn is ice hockey
diamond is the hardest thing on earth
The hardest matter on earth is Diamond.
Rugby!
Diamond is the hardest mineral on earth.
yes diomand is the hardest thing on earth
its not! Gymnastics is
Boxing, by far.
Gymnastics is definitely a sport!! And it's one of the hardest sports out there!!
The hardest sport in the world is Fishing. Yes it is a sport. Search it in Google.
Sport Science - 2007 Hardest Hits - 1.2 was released on: USA: 14 October 2007
The diamond is the hardest rock (or mineral).