Horizon explores the boom in health-related apps and gadgets, as well as how technology is helping medical professionals monitor fitness and health in unprecedented ways.

Dr Kevin Fong explores a medical revolution that promises to help us live longer, healthier lives. Inspired by the boom in health-related apps and gadgets, it's all about novel ways we can monitor ourselves around the clock. How we exercise, how we sleep, even how we sit.

Some doctors are now prescribing apps the way they once prescribed pills. Kevin meets the pioneers of this revolution. From the England Rugby 7s team, whose coach knows more about his players' health than a doctor would, to the most monitored man in the world who diagnosed a life threatening disease from his own data, without going to the doctor.