Research has shown that strengths use and development can foster individual performance and well-being at work. However to date little is known about the underlying psychological processes that might be operating in this relation. The purpose of this study was first to confirm the strengths use to work performance association and second to assess theoretical models of strengths use by testing a path model from strengths use to work performance through harmonious passion subjective vitality and concentration. This study was conducted on a sample of 404 French-speaking Canadian workers and structural equation modeling analyses were performed in order to test the proposed model. Results show an association between strengths use and work performance. Further this relation is completely mediated by the proposed variables. Theoretical and applied implications are discussed.