Fitness Xtreme Skillastics was designed as a health-related activity teaching tool that prepares middle school and high school students for FITNESSGRAM® testing. Fitness Xtreme Skillastics incorporates all four fitness components: flexibility, cardiovascular endurance, muscle strength, and muscle endurance. Fitness Xtreme allows children of varying ages and fitness levels to participate in fitness activities that instill positive exercise habits that last a lifetime.