Grant McCartney is known as the Island Ninja, but lately, he’s been earning the title of the Wandering Ninja.
In order to prepare for season nine, Grant traveled all over the country to train with as many American Ninja Warriors as possible.
But he also had another trick up his sleeve. Grant practices controlling his heart rate and breathing in water. Not just the lovely waters of his home in Hawaii. No, Grant likes ICE PLUNGES.
Check out the full interview above.