PHYSICAL EDUCATION GRADE FOUR-FITNESS Flexibility Cardio Respiratory Endurance Fitness Content Vocabulary: Flexibility Cardio respiratory endurance Muscular strength Muscular endurance Curl-up Push-ups Abdominals Biceps Triceps Pectorals Hamstrings Muscular Endurance Muscular Strength Essential Understandings/Concepts: K-4.3.2 Engage in sustained physical activity that causes increases in heart rate and breathing. K-4.3.1 Demonstrate several activities related to each component of health related fitness.