The functional declines of advancing age are depressing. The heart's ablity to pump blood drops about one per cent: blood flow to arms and legs decreases by thirty to forty per cent in old age. The amount of air a person can exhale after a deep breath lessens and the chest wall stiffens with age. However, recent studies have shown that most of these age-associated eclines can be delayed by exercise. Exercise lowers the resting heart-rate and increases the amount of blood pumped with each beat in older people. When stress is placed on bones through exercise, calcium content rises, with the result that resistance to fracture is improved.
'Which one of the following statements is correct?

Options

A. Exercise delays natural decay of old age
B. Old age problems increase due to exercise
C. Exercise increases the heart-beat which is dangerous
D. Exercise creates stress which is harmful to bones

Answer

A