Certified personal trainers (CPTs) work with many individuals that have difficulty with the motivation to adhere to unsupervised exercise. Attributional retraining (AR) is a method designed to redirect the client’s perceived causal attributions for failure toward controllable factors. The purpose of this qualitative case study is to see if certified personal trainers find value in and are willing to perform AR after being exposed to education of how to use the method to help their clients with exercise motivation and adherence. Three research questions were explored: (1) How do certified personal trainer perceptions of attributional retraining impact client motivation? (2) How does attributional retraining impact the level of motivation for personal training clients? (3) How does attributional retraining contribute to improved client experience and adherence? Twelve (n = 12) certified personal trainers (CPTs) working in New York City volunteered and completed the study. Participants attended a four-hour workshop on AR and contributed their insights via pre-workshop interviews, documentation, session observations, and post-observation interviews over the course of three months. Their responses were manually noted and then manually coded for themes. Research question one themes: (1) CPTs admit they could do better at implementation, and (2) CPTs would have made changes if they were to do it again. Research question two themes: (1) clients focus more on an internal locus of control, (2) perceived client experience was highly beneficial, and (3) participants recommend other CPTs learn and apply AR with their clients. Research question three themes: (1) strategies implemented, (2) increased effort, and (3) successful retraining. In summary, certified personal trainers (CPTs) perceived interventions using attributional retraining (AR) as helpful in increasing unsupervised client exercise motivation and exercise adherence.