Collect of Kerry at competition with Steven and Aaron. See SWNS story SWLNweights; Meet the bodybuilding family - including a mum who became a world champion in just 18 months of training and her 11-year-old son who she reckons is 'the new Arnie'. Mum-of-four Kerry MacDonald, 43, only set foot in a gym for the first time in April 2021 but has since won multiple competitions. Her youngest son, Aaron, 11, has become an avid fan and although he hasn't yet started doing weight training, one business has already offered him a sponsorship, while Oliver, 14, likes working out a few times a week. Their dad, Steven Johnston, 47, urged Kerry to try bodybuilding when the couple first started going out 18 years ago, but she was too shy. Steven keeps her training regime on the rails and gives Kerry encouragement, but she was inspired by to take it up by a pal who won Miss Cumbria and also has a coach.