Answer:
aerobic exercise
Explanation:
Aerobic exercise is popularly known as cardio exercise and it is the most beneficial exercise for the fitness of the heart as it causes repeated contractions of the heart muscles and strengthens them.
Besides this there are several benefits offered by aerobic exercise for the fitness of the cardiovascular system :
1. It is aerobic = oxygen providing. Therefore, it improves the circulation of oxygen in the body that helps in providing energy.
2. Lowers blood pressure.
3. the risk of developing heart disease is lowered.