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Mary Duffy in the gym. See SWNS story SWOCgrandma; Meet one of the world's toughest grandmas - an international powerlifting champ who says she looks and feels better than she did 30 years ago. Mary Duffy, 71, took up gym work outs aged 59 in a bid to lose weight, and soon got hooked on lifting weights. Now she spends around 20 hours a week pumping iron and exercising, and has more than 30 state and world records to her name. The pocket rocket can lift more than many men a quarter her age - but is regularly told she's "too old" to be hitting the gym. But she's proved the doubters wrong, and holds world records for deadlifting 250lb - more than a baby elephant - as well as benching 125lb and squatting 175lb. The gran-of-one said her up to six hour daily gym sessions means she feels better than she did aged 40. Mary, from Trumbull in Connecticut, USA, said: “I started seriously going to the gym ten years ago when I realised I’d put on a lot of weight - I remember it hit me when I looked in the mirror and thought ‘that’s not me’.