The ability to sustain aerobic activity for a prolonged period of time is known as cardiorespiratory fitness.
Cardiorespiratory fitness or endurance refers to the ability of the circulatory as well as respiratory systems of the body to provide fuel or power during sustained aerobic activity.
In order to enhance one's cardiorespiratory fitness, physical activities which maintain heart rate elevations at a safe level for a sustained length of time, like walking, running, cycling, etc. need to be attempted.
The cardiorespiratory fitness is linked with the functioning of heart, lungs as well as blood vessels. However, one should slowly increase the pace when performing such activities.
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