Strength comes from your central nervous systems ability to properly recruit all of that muscle to perform a lift. Muscle size and technique both also play a large role in your strength potential.
Someone who trains purely for strength will have a much more efficient and effective CNS than someone who trains purely for size. They will be able to efficiently recruit all of their muscle fibers, and their technique for a particular lift is honed to such a level that there is no wasted energy in properly getting that weight where it needs to be.
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