The ability to maintain physical exertion for long periods of time is called endurance.

There are different types of endurance:

* Cardiovascular endurance: The ability of the heart, lungs, and blood vessels to deliver oxygen to working muscles for an extended period.

* Muscular endurance: The ability of a muscle or group of muscles to perform repeated contractions over a period of time.

* Mental endurance: The ability to focus and maintain effort despite fatigue or discomfort.

Endurance is an important aspect of overall fitness, and it can be improved through regular exercise.