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The purpose of this study was to examine the fidelity of implementation of a six-week integrated Nonlinear Pedagogy–Universal Design for Learning (NP-UDL) intervention in middle school physical education. The secondary purpose was to determine whether fidelity predicted student motor performance. Fidelity was assessed weekly using a 14-item observation tool across two instructional groups (expert-led and ecological). Two-level hierarchical linear models indicated that higher fidelity significantly predicted improvements in Loughborough Soccer Passing Test (LSPT) penalty time, but not Kick and Receive performance. Expert-led classes demonstrated consistently higher fidelity. The fidelity tool showed strong sensitivity and specificity. Findings supported fidelity as both a methodological safeguard and a predictor of student performance in general physical education.