There’s no question that exercise is important for our health, but many of us find it difficult to fit into our busy schedules. In this episode, Michael Mosley explores how high-intensity interval training, HIIT for short, might be the most time-efficient way to get fitter. It can also boost your cognitive performance, help you live longer, and improve your quality of life. Martin Gibala, Professor of Kinesiology at McMaster University in Ontario, reveals all about the beneficial impact of HIIT on your cardiorespiratory system, your ability to control your blood sugar levels, and your risk of chronic diseases. Meanwhile, busy mum and NHS worker Suzanne finds HIIT a great way to incorporate a workout into her hectic routine. Series Producer: Nija Dalal-Small Editor: Zoë Heron A BBC Studios production for BBC Sounds / BBC Radio 4.