This podcast episode explores the topic of gastrointestinal (GI) distress in runners, discussing the launch of a free app that provides information and solutions for this issue. It highlights the physiological changes that occur during running, such as increased intestinal permeability and blood flow diversion from the digestive system, which can contribute to GI distress. The episode also provides practical advice on managing GI distress during long runs and emphasizes the importance of sweat testing, nutrition at aid stations, and heat training for runners. It delves into the intricacies of heat training, iron levels, and the potential risks of excessive iron intake. Additionally, the episode emphasizes the importance of establishing a strong foundation of health and acclimation before relying on advanced nutrition and gear. The hosts also discuss a neon sign in Stefanie Flippin's office, which symbolizes the podcast's commitment to providing valuable information and motivation.