Endurance is the answer i think you're looking for.
Self concept is best defined as a combination of self-image, self esteem and your ideal self. ... Your self concept can change on a regular basis because you see and interpret things differently depending on your feelings, beliefs and attitude.
Answer:
B) Bone Density
Explanation:
Cardio-respiratory fitness, muscular strength, and flexibility are important to health-related fitness, while bone density is not.
