Meet one of the world’s toughest grandmas, an international powerlifting champion who says she looks and feels better than she did 40 years ago. Mary Duffy, 71, from Trumbull in Connecticut, took up gym workouts at the ripe age of 59 in a bid to lose weight—and soon got hooked on lifting weights. Now, not only does she spend around 20 hours a week pumping iron and exercising, but she also has more than 30 state and world records to her name. Though Mary, who is a grandmother of one, can lift more weight than many men a quarter her age, she is regularly told she’s “too old” to be hitting the gym. However, Mary has proved the doubters wrong. She holds world records for dead lifting 250 pounds (approx. 113 kg)—which is more than a baby elephant—as well as benching 125 pounds (approx. 56 kg) and squatting 175 pounds (approx. 79 …