Pull ups vs Chin ups The pecs and biceps are used more actively during supinated-grip pull-ups than during the pronated-grip. The pronated-grip pull-up has greater activation of the lower trapezius than the supinated-grip. Many believe that the "chin-up"
Pull ups vs Chin ups The pecs and biceps are used more actively during supinated-grip pull-ups than during the pronated-grip. The pronated-grip pull-up has greater activation of the lower trapezius than the supinated-grip. Many believe that the "chin-up"

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