Misogi training is no doubt grounded in a spiritual exercise, but I've come to it simply through sports. I began swimming in Lake Washington every day last summer, and have not quit. The Lake water temperature is now in the 50s, the air temp is dipping into the 40s, but, obviously the air temp does not matter. I am not dealing with air temperature, a lesson in economy of motion. Don't respond to what is not fighting you.
I am no longer diving straight in since the lake is giving me a tiny popsicle headache at the base of my skull, so I step down the ladder off the dock plow backwards into the lake, adjust my body to the water and then let my head go under water. Then comes the headache until I warm up in the water.
My guess is misogi training informs aikido in practice. My aikido is to a degree becoming an extension of swimming in Lake Washington. I practiced in SF last Friday night, a brown belt was trying to resist the visitor in the techniques (I love practicing with brown belts the most, they don't hold back! And they know how to fall...) I gave him the experience of diving into cold water. Hard to explain how that is, but I brought it to the technique, and he had the look I feel after I am swimming. Curious, fun, scary, ouch, safe enough...
But it is surprising how little it takes to pick up a new edge.
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