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The purpose of this study was the application of a year-long intervention program, in typical Greek physical education school classes, which aimed to change motivational climate, goal orientations, motivation, and students' attitudes toward exercise and nutrition. Participants in the intervention program included 105 Grade-10 students, and 529 students of the same age took part as a control grou|pImmediately after the intervention, students in the experimental group compared to the control group: (a) had more positive attitudes toward exercise, participation in sports, and eating fruit; (b) perceived the motivational climate of the class as more task involving and less ego involving; and (c) spent more time exercising per session. The small significant effects that disappeared 10 months after the intervention imply that further theory development and interventions are needed.