Marco Altini is a data scientist & entrepreneur with a broad set of skills. After a Ph.D. in applied machine learning and an additional Master's degree in Human Movement Sciences, Marco is currently an advisor for Oura and the founder of HRV4Training. This episode digs deeper into his unique perspective from the research, business, and entrepreneurship sides. Of course, Heart Rate Variability (HRV) is also discussed, as well as how to build tools & apps in general that can be validated. We hope you enjoy this very inspiring conversation!