In this episode of Fast Physiology on the Critical Oxygen podcast, I am joined again by Coach Dave Schell where we discuss sweet spot or gray zone training. We start by defining sweet spot training as high zone three to low zone four training, which is has been used to accumulate training stress for time crunched athletes while also improving performance. We explore the history of sweet spot training and its popularity among time-crunched athletes. The conversation also delves into the drawbacks of excessive sweet spot training and the importance of periodization and specificity in training. The episode concludes with key takeaways, emphasizing the need for a balanced approach to training and the importance of individualization.