I don't care how good you are with a whip, you're not going to out maneuver a whole squadron of Nazis. Jason Bourne can kick some serious tail, but trying to outwit the federal government in the United States is a lost cause. I don't care how good you are at martial arts.
The fact remains that there are people out there that live a real life of adventure and survived long enough to write a book about it. It may not be as exciting as the stuff Hollywood dreams up, but you can imagine what it must be like to survive a kidnapping attempt or be an agent for the KGB. I once had the pleasure of speaking with someone who wrote a book about his adventurous life.