Yea but in reality its how your body works, you send electricity to the muscle to make it work, we just have better rheostat control
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My back don't like typical ab stuff, not bad enough for an operation or do I need drugs but I don't piss it off on purpose.
I can ride my bike for my legs.[that helpped my back allot]
Upper body takes care of itself working on crap,
I need some around the middle work