The purpose of the study was to analyze students' motivation in relation to their participation in fitness testing classes. Participants were 134 Finnish Grade 5 and 8 students. Students completed the contextual motivation and perceived physical competence scales before the fitness testing class and the situational motivation questionnaire immediately after the class. During the fitness test class, abdominal muscle endurance was measured by curl-up test, lower body explosive strength and locomotor skills by the five leaps test, and speed and agility by the Figure 8 running test. For the fitness testing class, students reported higher scores for intrinsic motivation, identified motivation, and amotivation than in their general physical education program. The result of the path analysis showed physical fitness was positively related to perceived physical competence. In addition, perceived competence was found to be a positive predictor of situational intrinsic motivation, but not of other forms of situational motivation. Significant path coefficients in the model ranged from -0.15 to 0.26.