Well, I weigh 184 pounds, and I can do it: so I guess until somebody else chimes in that's the record.
My brother in law weighed about 150 when he benched 300. He now weighs 195 lbs and is about 5`9" and he just got 450 lbs on flat bench yesterday. Had 460 almost racked.
A kid at my high school is 16 years old and weighs 170 and benches 310.
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