In this episode I talked to Dr. Martin Gibala, who is a Professor in the department of Kinesiology at McMaster University in Ontario (Canada). He is a world renown scientist who has done pioneering work to understand the physiological effects of interval training in general and, more specifically, high intensity interval training (HIIT). HIIT is a very time efficient type of training that is characterized by short bouts of high intensity exercise combined with short periods of complete rest or active recovery. We start talking about how time efficient really this type of training is. We also talk about recent studies showing that, even very short sessions of HIIT involving only three bouts of exercise of 20 seconds, can trigger very strong physiological adaptations. We discuss the mechanisms behind HIIT and whether this type of exercise could be a viable alternative to more traditional types of training. Dr. Gibala is the author of the book: The one minute workout. You can follow his research at https://martingibala.com or on twitter https://twitter.com/gibalam.