Only the very best made it through the heats, but now the competition steps up a gear as we enter the semi-finals of Australian Ninja Warrior.

Australian Ninja Warrior is back with 300 Ninjas taking on the World's toughest obstacle course in their quest to become Australia's first Ninja Warrior.

Australian Ninja Warrior is back with 300 Ninjas taking on the World's toughest obstacle course in their quest to become Australia's first Ninja Warrior.