This study addressed teachers' fidelity to one Physical Education curricular model. The theoretical framework guiding this study included professional development and fidelity to curricular models. In this study, teachers' fidelity to the Dynamic Physical Education (DPE) curricular model was measured for high and nonsupport district groups. Participants were 20 Physical Education teachers. Ten teachers worked in a highly supportive district, while 10 teachers worked in nonsupportive districts. Data were collected using field notes, a DPE observation instrument, and informal interviews. Two themes emerged from the data: (a) district support led to higher teacher fidelity levels to the DPE curriculum, and (b) the teachers from the nonsupport district implemented management procedures differently than the high support district teachers. (Contains 3 tables and 1 figure.)