The series that explores the limits of the human body like never before.Adventurer Todd Sampson is on a mission to investigate some of the most extraordinary people on the planet to see what we can all learn from their lives. To truly understand them, he will not only walk in their shoes, he will hack into their world using science as his guide.This is the story of human potential and how our mind and body can adapt to almost anything. In this fourth series, Todd finds out what its like to be in an American Demolition Derby, undergoes an initiation into Voodoo andtrails with the masters of five distinct disciplines of martial arts in Japan.