I joined the Navy right out of high school. Physically, I'm Mr. Average. So the question is, what's the matter with this picture?
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The really nice but much bigger guy that was assigned to move this oxygen tank with me trudged ahead but the ship took a tweak and so did my back. I didn't know it at the time but I broke off a little tip of a wing-like structure of one vertebrae. This occurred in my middle back just below my right shoulder blade.
My body has done what bodies try to do which is adapt to the situation and keep going. Most of the time this isn't an issue...except when practicing zazen or doing some exercises at the gym.