Objective: In recent years there has been a growing interest in research related to the use of strengths. Although results from past research have consistently suggested that the use of strengths is associated with higher performance and greater well-being there is, as yet, no clear theory describing how using strengths might contribute to greater well-being or goal progress. The objective of the current research was to test a model of how strengths use may support performance and well-being through an extension of the self-concordance model of healthy goal attainment. Design: We test a repeated measures cross-sectional model in which using signature strengths is associated with goal progress, which is in turn associated with the fulfillment of psychological needs, and in turn wellbeing. Method: Participants were 240 college students who completed measures of psychological strengths, need satisfaction, well-being, goal progress and goal attainment at three time points over a three-month period. Results: Our results demonstrate that strengths use is associated with better goal progress, which is in turn associated with psychological need fulfillment and enhanced well-being. Conclusions: Strengths use provides a key support in the attainment of goals, and leads to greater need satisfaction and well-being, providing an extension of the self-concordance model of healthy goal attainment. Implications for practice and future research are discussed.