I think you lads are confusing Martial Prowess with Martial Spirit! Spirit is a concept, a mind set, not a skill and this is taught through a combination of education and experience. No one is just born with martial spirit...although some of us are certainly born more aggressive than others.
A foundation of military classics in reading is certainly a good start: The Art of War, The book of 5 Rings, Musashi, War as I knew it, The Desert Fox,The Rogue Warrior guide to strategy and leadership (my personal favorite), etc...you could also add biographies of great warriors throughout history.
There are tons of cheesy films to choose from: Rudy, Karate Kid, Gladiator, Braveheart, Twilight Samurai, The 300, Shaw Bros films, etc...
Then the application of Martial Spirit: Competitive training in a fun setting like paint ball, contact sports Rugby, Football, etc. Mix in challenging physical training...pushing the student past the comfort zone, obstacle courses, mud runs, bag work and add some sparring, weapons training...either modern or older. I think a great place to start might be Krav Maga classes.
The key is to get the person thinking, acting in ways to succeed, in a physical or martial way. Learn from there experiences...build confidence and review past failures...you will never learn more than you can from failure.
I rest my case.
"if its ok for shaolin wuseng to break his vow then its ok for me to sneak behind your house at 3 in the morning and bang your dog if buddha is in your heart then its ok"-Bawang
"I get what you have said in the past, but we are not intuitive fighters. As instinctive fighters, we can chuck spears and claw and bite. We are not instinctively god at punching or kicking."-Drake
"Princess? LMAO hammer you are such a pr^t"-Frost