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 By harnessing the powers of nature the ninja built a legendary reputation as survivalists with an ability to thrive in even the most inhospitable situations. By studying their ancient philosophy and techniques alongside modern science you can prepare yourself to survive in any outdoor environment.The basis for ninja survival skills comes from the Buddhist philosophy of the five elements: Earth, Water, Fire, Wind, and the Void. By understanding how the elements relate to the human body, the formula for survival becomes clear.