John Tunstall (Intelligent Solutions) & Doug Strycharczyk (AQR International)Economist Doug and engineer-turned-seller John unpack mental toughness, a measurable personality trait describing how we respond to challenge, stress, pressure and opportunity. The episode details the components that combine into mental toughness (resilience, self-belief, confidence, willingness to change), the eight-factor framework and questionnaire behind it, research linking mental toughness to both wellbeing (anxiety, stress, sleep) and performance, why mentally tough people still feel pressure but handle it differently, why self-awareness matters more than raw toughness, and why sales, like policing and the military, is a profession where this trait matters most.