Weightlifting grandmother trains in the gym more than 16 hours a

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

Linda Arvey is powerlifting, weightlifting in York County, Pa.

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Amy Reast The Independent

Grandma, daughter and granddaughter say they constantly get mistaken as sisters

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

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Powerlifting grandma says she feels better now than 30 years ago

Amy Reast The Independent