By Charlie Duffield A mother of four has revealed how she managed to shed half her bodyweight and hone her lean, healthy physique. Jemma Hahn lives in Mandurah, Western Australia and back in 2021 weighed nearly 16-and-a-half stones. She wanted to make a drastic lifestyle change and so the 37-year-old joined the Australian weight loss community The Healthy Mummy, after finding an online advertisement. She started eating a wholefood diet via recipes on the app and found a new love for swimming and home workouts. It was a totally different experience for the former yo-yo dieter, who had spent a l…