character: Serena Williams
topic: Cardio workouts for improving tennis performance
grade: 12
subject: Physical Education
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character: Venus Williams
topic: Aerobic exercises for enhancing athletic ability
grade: 12
subject: Physical Education
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character: Roger Federer
topic: Endurance training for tennis players
grade: 12
subject: Physical Education
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character: Rafael Nadal
topic: High-intensity interval training for sports performance
grade: 12
subject: Physical Education
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