With the bottom-up bench press from pins, there's no pre-stretch and no contribution of the stretch reflex. Your muscles have to produce more force at the beginning of the movement. This not only strengthens the muscles themselves, but it increases their capacity to be recruited in the stretched position.
By inhibiting the stretch reflex, you rely almost entirely on the contraction of the muscles. The result is a more forceful contraction, and lots of gains in size and strength. In that sense, it's the upper-body equivalent of a deadlift.
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