This article, published by Spring Health, addresses the organizational importance of manager effectiveness and the case for structured manager training programs. The central argument is that managers are disproportionately influential in shaping employee engagement, mental health, and organizational outcomes, and that this influence is underserved by current training investments. Drawing on Gallup's State of the Global Workplace report, the article cites that managers account for 70% of the variance in employee engagement and that managers themselves report more negative daily experiences than non-managers. Spring Health President and Co-founder Adam Chekroud is quoted on the stress experienced by first-time managers, particularly those promoted from individual contributor roles without adequate preparation. The article outlines a multi-component training framework including blended learning, peer coaching, pre- and post-surveys, and continuous reflection. It also draws on commentary from Dr. Martin Paulus regarding the role of personal narrative in resilience. The implications drawn are that investing in manager development is both a mental health and business performance imperative, with Spring Health positioned as a provider of such solutions. Key insights: Gallup's State of the Global Workplace report is cited as finding that managers account for 70% of the variance in employee engagement, underscoring their outsized organizational influence. Managers are reported to experience more negative daily experiences than non-managers — including higher rates of stress, sadness, anger, and loneliness — suggesting that manager well-being is itself an organizational risk factor. The transition from individual contributor to manager is described as a significant and often undertrained life event, with many first-time managers promoted on the basis of technical performance rather than people management capability. Practical takeaways: A multi-component training model — combining pre-surveys, blended learning, peer coaching cohorts, and post-training assessment — is presented as a structured approach to measuring and developing manager effectiveness. The article frames manager training as iterative rather than episodic, emphasizing that skill development in leadership requires repeated cycles of learning, application, reflection, and adjustment.