28. physical fitness can be broken down into four health-related parts – cardiorespiratory endurance, muscular strength and endurance, flexibility, and body composition. the following relates to muscular endurance: a. the ability of your heart, blood vessels, and lungs to distribute nutrients and oxygen and to remove wastes. b. the ability of muscles to keep working for an extended period of time. c. the ability to use a muscle throughout its entire range of motion. d. is the amount of body fat compared to lean tissue, such as muscle and bone.