Cardiorespiratory fitness is a term that, basically, refers to the ability of the heart and lungs to bring oxygen to the muscles during physical activity .
There are certain sports that are dependent on a high level of cardiorespiratory fitness, including track and field, basketball, skiing, swimming, and soccer.
With regular exercise, the cardiorespiratory system becomes more and more efficient. This is accomplished by strengthening the heart muscle, which enables more blood to be pumped with each heartbeat. [Cardiovascular Fitness]
In addition, there is an increase in the number of small arteries in the conditioned skeletal muscles. More arteries mean more blood going to the muscles that are actively involved in the work. The larger the muscle groups, the more blood, thus an overall improvement in cardiovascular health.
In addition, these kinds of cardio exercises will improve the respiratory system. By increasing the amount of oxygen that is inhaled, the lung capacity will go up. That means more and more oxygen will be distributed to body tissues.
The gold standard for exercises that improves cardiorespiratory fitness is any of the many forms of aerobics, but there are sport specific drills that will not only improve the necessary skills, but increase your cardiorespiratory fitness as well.
If you are out of shape, be sure to begin gently and work your way up slowly over a period of time. Allow your cardiovascular and respiratory system to grow stronger gradually. Your heart and lungs will thank you.