It strikes four times faster than a snake. It kicks with more than 1,000 pounds (453.59 kg) of force. And it can rival the impact of a 35 mph (56.33 kph) car crash. It’s the most complex weapon ever designed—the human body. National Geographic Channel brings together a team of experts and a cross section of champion martial arts masters to analyze the world’s greatest fighting techniques and find out which discipline has the hardest hits, the fastest moves, and even the deadliest weapons.