prolific - Dictionary definition and meaning for word prolific
"Production Lifted"--> They produced large amounts of the product = Their production was lifted up in amount = They were PROLIFIC.
PROLIFIC is PROFITic. (profitable, because of high yield)
prolific ~ pro (production) + life; now try to relate meaning of prolific with 'production of life'.
prolific- pro lifts, professional bodybuilders lift great quantities.