This study examined how achievement goal orientations, perceived sport competence, perceptions of success, and perceived outcome attributions affect children's exercise-induced feeling states following physical exercise. The construct validity of the Exercise-Induced Feeling Inventory and a modification of the Causal Dimension Scale II for children was also investigated. Children (N = 304) responded to measures on the above scales. Task orientation, perceived success, and an ego orientation, combined with high perceptions of sport competence, were positive predictors of states of positive engagement, revitalization, and tranquility; only task orientation was a negative predictor of physical exhaustion. The locus of causality dimension appeared to mediate the impact of perceptions of success on positive engagement, but with a negligible effect. The results were consistent with previous findings highlighting the motivational advantage of adopting a task orientation in physical achievement situations and demonstrated the role of task orientation as a determinant of affect in exercise testing in children.