70-year-old woman shows off muscles after training for bodybuilding competition .

Many 70-year-olds may be spending their days in relaxing retirement, but not Mary Clayton. The great-grandmother gets to the gym at 4.30am six days a week to train for bodybuilding competitions. Her hard work has paid off too, as she won the over-60s section of the International Natural Body Building Australia Queensland Titles and is heading to the national titles this weekend.