how martial arts relate to spirituality
Ninjutsu (nin means endurance and jutsu means art) is a manifested martial art from various religions. It comes from Japanese / Zen Buddhism (e.g. Samuraijutsu) from Shintoism (e.g. Sumo) from Taoism (eg. Tai Chi Chuan) from Chinese Buddhism (e.g. Shaolin & Wing Chun Kung Fu) from Buddhism (e.g. Muay Boran and Bokator) from Sanātana Dharma (e.g. Kalaripayattu). It is old (around 900 years) but not so old, but based on ancient knowledge of spirituality. Is surviving (or learning it) such a bad thing? It is unavoidable, for even in an urban evnironment, there are plenty of pollutants and competitors (both in demand and supply) to handle, aside from massive amounts of bacteria (which the body is composed more of than human cells themselves) and viruses. Besides, criminals are mostly concentrated in urban environments (not natural ones) and are mostly interested in money, and even if you do not have it then they can still go for your clothes / accessories / organs (to sell) anyway.