Answer:
The efficiency of your heart to carry oxygen through the body.
Explanation:
Cardio-respiratory fitness is the relationship between your heart and your respiratory system during physical activity, and its efficiency in transporting oxygen to various parts of your body. What can define a good physical health is the efficiency in the absorption of oxygen by the muscles as well.
With the constant practice of Cardio-respiratory exercises the benefits to the body are enormous as: Increased muscle strength, endurance, better blood circulation and improved mental health.
