Arrows, grenades, and mines are different kinds of weapons. Each is a very good weapon but each has very different qualities that make it suited to its purpose. Arrows are about precision. It does no good to get them in the general vicinity of the target. They must hit exactly on a particular target to kill. Grenades, on the other hand, are area-effect weapons. A grenade can be very effective if you just get it in the general vicinity of the enemy. But grenades have their limitations. Hold it a couple of seconds too long and it kills you. Throw it a couple of seconds too early and the enemy dives for cover or throws it back. Grenades are about timing. Mines are also area-effect weapons, but they are all about proper positioning and concealment. An improperly placed or camoflaged mine will be swept prior to detonating on target.
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Similarly, different martial arts emphasize different qualities to the point that you might say each art has its own
spirit. You can easily tell the difference between Shotokan karate, Isshinryu karate, and Taekwando (Korean karate) because they have different spiritual qualities. When martial arts masters talk about their arts developing the person spiritually, they are typically talking about developing these particular intangible qualities in the people.
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Because different martial arts have different emphases, or spirits, some will complement others. In my experience and opinion. Aikido, Judo, and Jodo go great together because they are mechanically similar but they develop different qualities in the practitioner.
.Aikido is often described as more cerebral. I like to think it is generally the most theoretically sound of these three martial arts. This does not make aikido impractical. Just the opposite. Aikidoka have, over the years, made probably the deepest study of using the principles of momentum and offbalance to survive striking attacks.
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Judo, while having part of the same theoretical basis as aikido, is extremely pragmatic. Everything is thrown in contest full force at speed against maximal resistance, so if it works, you know for certain it really works. I've heard street fighters say they'd rather have a judo guy on their side than any other martial artist because they are toughened and practical. I've also heard judo teachers say that
anything that makes the opponent hit the ground hard, fast, and on his back is good technique.
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Jodo is the art of the stave. It is practiced against an opponent with a sword, which you might say detracts from its practicality. When will you ever fight a sword guy with a stick? But because of its extremely dangerous nature, jodo develops within the practitioner an awesome, careful precision and sense of distance and timing.
.Though, in my experience, judo, jodo, and aikido complement each other because they develop sound motion theory, reasoned pragmatism, and exacting precision, that does not mean that this is the only conceivable combination of arts to acheive this particular type of spiritual growth. For instance. I could see substituting Shotokan for jodo and still developing an awesome precision. Alternately you might substitute Isshinryu for judo and still develop pragmatism.
.Though I might not go so far as
some of my fellow bloggers to say that eclectic or 'mixed martial arts' are not
true martial arts, I will say that these gendai (new) martial arts each developed and purified its own training over time to perfectly facilitate development of their own specific spiritual traits. These systems are perfectly designed to cause the effect that they cause. So, while MMA practitioners might develop a healthy balance in their skills, they might not develop theoretically as well as (for instance) an aikidoka or they may not develop the precision and kime that the karateka develops.
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In his book,
Twelve Winds, Karl Geis likens the modern 'pure' martial arts (i.e. judo, aikido, karate) to petroleum products. Kerosine, vasoline, and gasoline are all wonderful, useful products because of the purification processes they have been through, but you wouldn't want to mix gasoline into your vasoline, would you? You'd ruin both products