Actually, it is exactly what the term "Muscle Memory" was first used to describe - not a literal memory in the muscles, but rather specific brain pathways and memorized nuron firing patterns built over many repetitions of the same action.
(first two google hits)
http://en.wikipedia.org/wiki/Muscle_memory
http://lifehacker.com/5799234/how-mu...s-your-success
Sure, there are google hits for this too - the third hit is one - but of course that is because it is an overused and completely unscientific advertising gimick used by hucksters selling exercise videos. Worse than that, your description dosnt even match what that advertising hype claims (of course at some point you have to lift more than 30 lbs for more strength increase - it only takes so much strength to lift 30 lbs..)
The phenomenon of Muscle Memory is key to improvement of ANY physical activity, and is exactly why practice is so important.
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