Answer:
bone density.
Explanation:
I used precess of elimination. U cannot improve the bone density by working out. You can improve your cardiorespiratory fitness by doing cardio, e.g. cycling, swimming, running etc. You can improve muscular strength by working out, e.g. push up, sit ups, etc. you can also become more.flexible by expanding ur muscles and tissues.
C. increases your reaction time
If he doesn't have friends, he will not be able to have the guidance/help one should need for their life
Answer:
It should be challenging to you
