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I had one due to a bulging disc in my neck and some pins and needles - it was fascinating, but I still remember them turning on the audio and letting me listen to my nerves trying to flex various muscles! My biceps sounded like a bit like white noise (good), while my triceps sounded like a plastic bag flapping outside a car window (bad!) The way they explained it some subset of my tricep nerves were firing harder to try and compensate for the ones affected by the disc bulge - but they couldn’t keep up the firing rate by themselves. Really interesting and somewhat explained my mediocre push-up performance!