Naomi Kutin claimed the astonishing achievement after squatting 15st — the same weight as Mike Tyson in his prime — despite weighing just 6.6st herself.The 4ft 8in year six pupil has been dubbed "Supergirl" by astonished powerlifters.And Naomi said: "A lot of my friends and all of my teachers didn't believe me when I said I had broken the world record. "It was only when I brought in my medal and certificate that they did. "Everyone thought it was really cool. "It's great being stronger than everyone I know. "I'm always beating the boys in sports at school." And her proud dad Ed, from New Jersey, US, said: "Naomi has always jumped higher and done more push-ups than other kids her age, even the boys. "But beneath it all she is just a normal, shy ten-year-old with an extraordinary talent. "She went out there, took her chance and won the right to be a world record holder." Naomi — who was n...