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Educational interventions are enhanced when researchers work with teachers through ongoing, trusting, and supportive relationships during intervention implementation. We used a design-based implementation research approach to co-design an educational intervention called Fraction Ball– a set of basketball games that support math learning by providing an embodied, playful, and physically active learning experience by modifying the lines on a basketball court to emphasize rational number learning. This qualitative case study draws on observations, interviews, and a focus group to understand how engaging in the co-design process endorsed teacher agency using the model for the study of teacher agency for social justice by Pantić (2015). We demonstrate that the co-design process supported different forms of teacher agency which facilitates intervention adaptation to local needs for sustainability.