Final answer:
The overload principle is a concept in developing aerobic fitness that involves gradually increasing the intensity, duration, or frequency of aerobic exercise to continually challenge the body and make adaptations.
Step-by-step explanation:
OVERLOAD PRINCIPLE is a concept in developing aerobic fitness that involves gradually increasing the intensity, duration, or frequency of aerobic exercise to continually challenge the body and make adaptations. By applying the overload principle, individuals can improve their cardiovascular endurance and overall fitness level. For example, if someone wants to improve their aerobic fitness, they can gradually increase the duration of their run or the resistance on a cardio machine.