Ian Hosek is the mind behind Hosek Performance Engineering (and endurance coaching company) and the 5th place finisher at the 2019 Spartan World Championships. Ian joins us to talk about his development as both athlete and coach, starting with his mindset as an engineer and continuing through his work at the Nike Campus (where he helped test the Vaporfly and Alphafly prototypes) and as a professional endurance athlete. We finish up with a "debate" on the efficacy and merits of Compromised Running.