Explanation:

Long term endurance refers to the ability to sustain physical activity over an extended period of time. It involves the cardiovascular system and the body's ability to efficiently deliver oxygen and nutrients to the working muscles. There are two terms that are commonly used to describe long term endurance: cardiovascular endurance and aerobic endurance.

Cardiovascular Endurance:
Cardiovascular endurance refers to the ability of the heart, blood vessels, and respiratory system to supply oxygen and nutrients to the working muscles during sustained physical activity. It involves the efficient functioning of the cardiorespiratory system, which includes the heart, lungs, blood vessels, and blood. This type of endurance is important for activities that require continuous and repetitive movements, such as running, cycling, swimming, and rowing.

Aerobic Endurance:
Aerobic endurance is closely related to cardiovascular endurance but also includes the body's ability to utilize oxygen efficiently during physical activity. It refers to the ability of the body to use oxygen to produce energy through aerobic metabolism. Aerobic activities are those that require a continuous supply of oxygen, such as jogging, brisk walking, dancing, and aerobic exercises. These activities help improve cardiovascular endurance and enhance the body's ability to utilize oxygen for energy production.

Both (a) and (b):
Both cardiovascular endurance and aerobic endurance are terms used to describe long term endurance. They are closely related and involve the efficient functioning of the cardiovascular and respiratory systems. The terms are often used interchangeably, as they both refer to the ability to sustain physical activity over an extended period of time and rely on the same physiological processes.

Muscular Endurance:
Muscular endurance, on the other hand, refers to the ability of the muscles to perform repeated contractions over a period of time. It is more focused on the muscular system rather than the cardiovascular system. Muscular endurance is important for activities that require repetitive muscle contractions, such as weightlifting, push-ups, sit-ups, and cycling uphill. While muscular endurance is important for overall fitness, it is not the same as long term endurance or aerobic endurance.

In conclusion, long term endurance is also called cardiovascular endurance and aerobic endurance, as both terms describe the ability to sustain physical activity over an extended period of time and rely on the efficient functioning of the cardiovascular and respiratory systems. Muscular endurance, on the other hand, is focused on the ability of the muscles to perform repeated contractions and is separate from long term endurance.