Study aim: To determine the relations between the general and physical education-specific achievement motivation, and physical fitness of adolescent girls. Material and methods: A group of 52 girls aged 15 years were studied by applying two questionnaires: P-O scale of Widerszal-Bazyl for evaluating the general achievement motivation and Nishida's AMPET for evaluating achievement motivation for learning in physical education (PE), and the International Physical Fitness Test. Results: Unlike the specific achievement motivation, the general one was uncorrelated with physical fitness variables and had no predictive value for that fitness. Nishida's indices of achieving success in PE correlated positively with some fitness variables, and the indices of avoiding failures--negatively. The only significant predictor for physical fitness proved the variable "overcoming obstacles". Conclusions: Motivational factors ought to be considered as a determinant of fitness test results attained by adolescent girls. The results confirmed the usefulness of Nishida's model in predicting physical education achievements. (Contains 1 table.)