The Youth Physical Activity Promotion Model (YPAP; Welk 1999), comprises an innovative and comprehensive framework integrating prior theory and research evidence from several areas. Currently, no published validation of the model exists. The purpose of this study was to test a potential measurement model for the Youth Physical Activity Promotion Model. Questions were taken from Whitehead’s (1995) Physical Self Worth scale (PSW), Harter’s (1985) Perceived Physical Competence scale (PPC), and Brustad’s (1993, 1996) Children’s Attraction to Physical Activity Scale, specifically subscales titled Liking of Games and Sports (LGS), Fun of Exertion (FE), Liking of Vigorous Exercise (LVE), Peer Acceptance (PA), and Parent Encouragement (PE). The composite 39-item questionnaire was administered by a researcher to 296 middle school (Grades 5 to 8) children under controlled classroom conditions. Measurement models corresponding to the 7 scales were tested separately using maximum likelihood confirmatory factor analyses via LISREL 8.5. All models converged within 12 iterations, and overall model fit statistics ranged from excellent (PSW c2(9) = 7.15; LVE c 2(5) = 4.93; PA c2(5) = 7.78) to moderate (PPC c2(14) = 31.46; LGS c2(5) = 34.91; FE c2(5) = 25.16) and poor (PE c2(9) = 83.79). Similar overall fit was indicated by various other normed and nonnormed fit indices. Item diagnostics (R2) indicated that some items could be removed to improve the moderately and poorly fitting measurement models. This would shorten the instrument, making it even more practical for large-scale research, without harming its validity for use in investigating the Youth Physical Activity Promotion Model.