Cardio-respiratory endurance is also known as -

Correct option is B

Cardio-respiratory endurance, also referred to as aerobic fitness, is the ability of the heart, lungs, and blood vessels to supply oxygen to the muscles during sustained physical activity. It measures how efficiently the cardiovascular and respiratory systems work together to meet the demands of prolonged exercise. Activities like running, swimming, and cycling primarily test this fitness component.
Aerobic fitness is a key determinant of overall physical health and is closely linked to reduced risks of cardiovascular diseases and improved stamina.
Explanation of Other Options:
· (a) Total Endurance: This is a broad term that includes both aerobic (cardio-respiratory endurance) and anaerobic endurance, but it is not a synonym.
· (c) Anaerobic capacity: Refers to the body's ability to perform high-intensity activities without relying on oxygen (e.g., sprinting, heavy lifting), distinct from cardio-respiratory endurance.
· (d) Muscular Endurance: The ability of a specific muscle group to sustain repeated contractions, not related to the efficiency of the heart and lungs.