Karate Kidding?!

This past Thursday, i went back to karate after missing about a month. Naturally, the first time back is always quite difficult, but this time, i felt as if i had missed much more. During the lesson, we were told we could order 30 concrete bricks for 100 NIS. What a bargain (apparently, it really is)! But why? To smash with our bare hands, of course. Um...i thought that was for brown and black belts. Apparently, if we want to go up a level (i'm only a green), breaking bricks is going to become part of the testing. So, whilst we condition our hands and prepare, i thought that some videos about the science behind brick breaking might be reassuring.

The Stats

• 13 blocks of concrete were used as a test case
• The sledgehammer delivered 709 lbs. of force, breaking 8/13 blocks
• The elbow broke all of the blocks, delivering 2000 lbs. of force (triple the sledgehammer)
• 1000 Gs of acceleration at impact, with a speed of 21 m.p.h

I'm thinking Peter Gabriel should revise his song 'Sledgehammer'

If you want to know the reason behind the physics, watch these clips. This experiment starts at about 4:15 into the clip. Apologies for the video quality--the sound seems to be slightly ahead.

The Five Rings and the Nine Commandments

This post is something i have been meaning to put out for a while. I haven't really blogged yet about martial arts, though it does periodically emerge with the other basic ideas of this blog. Though it's made great headway recently (probably because of the growing popularity of Japanese water stones) Japanese woodworking is something that is not covered in great detail in many woodworking magazines. The most obvious difference between the woodworking styles is that Western hand planes and saws are pushed,  whilst Japanese pull the tools toward them (much more intuitive, i think). In Tora Dojo, our sensei very often emphasises the importance of the returning hand during a punch. Often, we do motion studies just to focus on the returning hand. Anther theme that is constantly stressed is the gathering up of energy from the ground and inwards before release. In Japanese woodworking,  pulling the kanna, or hand plane, is an act that reflects this motion, engaging the woodworker's body in rhythmic movement and stances similar to those in karate. The attention to a centre of gravity and from 'rooting' one's actions in the earth is further paralleled in the position of the woodworker, who typically sits on the ground, sometimes even atop the work piece.

The connection between martial arts and woodworking is the underlying metaphor of Miyamoto Musashi's seminal A Book of Five Rings, in which the way of the warrior is compared to the way of the carpenter. 

Musashi acknowledges that 'there are various Ways. There is the Way of salvation by the law of Buddha, the Way of Confucius governing the Way of learning, the Way of healing as a doctor, as a poet teaching the Way of Waka, tea, archery, and many arts and skills. Each man practices as he feels inclined.'

Those of us who spend the time away from the dojo in scholarship (like the monks who studied Tai Chi!), might find affirmation in Musashi's statement that 'the warrior's is the twofold Way of pen and sword, and he should have a taste for both Ways.' We'll leave Hebrew calligraphy for another post. At the end of his introduction to The Book of Five Rings, Musashi boils his strategy down to 9 fundamental tenets:

1.   Do not think dishonestly.
2.  The Way is in training.
3.  Become acquainted with every art.
4.  Know the Ways of all professions.
5. Distinguish between gain and loss in worldly matters.
6.  Develop intuitive judgement and understanding for everything.
7.  Perceive those things which cannot be seen.
8.  Pay attention even to trifles.
9. Do nothing which is of no use.

Below are some excerpts focussing Musashi's comparison of the warrior to the carpenter. To read the entire work online, click here:

Fourthly the Way of the artisan. The Way of the carpenter is to become proficient in the use of his tools, first to lay his plans with a true measure and then perform his work according to plan. Thus he passes through life. These are the four Ways of the gentleman, the farmer, the artisan and the merchant.

Comparing the Way of the carpenter to strategy

The comparison with carpentry is through the connection with houses. Houses of the nobility, houses of warriors, the Four houses, ruin of houses, thriving of houses, the style of the house, the tradition of the house, and the name of the house. The carpenter uses a master plan of the building, and the Way of strategy is similar in that there is a plan of campaign. If you want to learn the craft of war, ponder over this book. The teacher is as a needle, the disciple is as thread. You must practice constantly.

Like the foreman carpenter, the commander must know natural rules, and the rules of the country, and the rules of houses. This is the Way of the foreman.

The foreman carpenter must know the architectural theory of towers and temples, and the plans of palaces, and must employ men to raise up houses. The Way of the foreman carpenter is the same as the Way of the commander of a warrior house.

In the contruction of houses, choice of woods is made. Straight un-knotted timber of good appearance is used for the revealed pillars, straight timber with small defects is used for the innter pillars. Timber of the finest appearance, even if a little weak, is used for the thresholds, lintels, doors, and sliding doors, and so on. Good strong timber, though it be gnarled and knotted, can always be used discreetly in construction. Timber which is weak or knotted throughout should be used as scaffolding, and later for firewood. The foreman carpenter allots his men work according to their ability. Floor layers, makers of sliding doors, thresholds and lintels, ceilings and so on. Those of poor ability lay the floor joist, and those of lesser ability carve wedges and do such miscellaneous work. If the foreman knows and deploys his men well the finished work will be good.

The foreman should take into account the abilities and limitations of his men, circulating among them and asking nothing unreasonable. He should know their morale and spirit, and encourage them when necessary. This is the same as the principle of strategy.

The Way of Strategy

Like a trooper, the carpenter sharpens his own tools. He carries his equipment in his tool box, and works under the direction of his foreman. He makes culumns and girders with an axe, shapes floorboards and shelves with a plane, cuts fine openwork and carvings accurately, giving as excellent a finish as his skill will allow. This is the craft of carpenters. When the carpenter becomes skilled and understands measures he can become a foreman.

The carpenter's attainment is, having tools which will cut well, to make small shrines, writing shelves, tables, paper lanterns, chopping boards and pot-lids. These are the specialities of the carpenter. Things are similar for the trooper. You ought to think deeply about this.

The attainment of the carpenter is that his work is not warped, that the joints are not misaligned, and that the work is truly planed so that it meets well and is not merely finished in sections. This is essential.

If you want to learn this Way, deeply consider the things written in this book one at a time. You must do sufficient research.