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This systematic replication of Fair Play Instruction (Vidoni & Ward, 2009) examined the effects of teacher prompts and praise on the students' positive (helpful) and negative (harmful) behaviors-verbal and non-verbal-in middle school physical education classes during daily soccer lessons. The results showed that positive behaviors increase during the intervention phase and persisted during the maintenance phase-more dramatically so with non-verbal than with verbal behavior. The negative behaviors either remained low throughout the study or decreased during the intervention and maintenance phases. Again, the most dramatic results in the desired direction were with non-verbal behavior. This study adds support to the viability of Fair Play Instruction for improving the sports-related social behaviors of students in physical education settings.