Weightlifting grandmother trains in the gym more than 16 hours a week

Mary Duffy, 71, spends around 20 hours a week pumping iron and exercising, and has more than 30 state and world records to her name

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Grandma, 71, Trains in the Gym for 16 Hours a Week, Has Set 30

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Powerlifting champ, 71, who spends 20 hours a week lifting weights