Sophie felt really well until she was 19 years old. Disruption in her life then caused her lung function to drop to 60 per cent in three months. Following three weeks laid up in the Royal Brompton Hospital, hooked up to monitors, undergoing a barrage of tests to try to find the cause of her dramatic drop in lung capacity, Sophie made the decision to regain 100 per cent lung function. She started running, qualified as a personal fitness trainer, and now, four years on, at the age of 24, she runs her own personal fitness company and hits the gym and lifts weights six days a week.