Final answer:
The interest in fitness has existed since ancient times, with civilizations like ancient Greece and ancient China valuing physical fitness. In the modern era, organized fitness programs and exercise for health gained prominence, with Kenneth Cooper's research on aerobic exercise making a significant contribution.
Step-by-step explanation:
The interest in fitness dates back to ancient times. In various civilizations, physical fitness and athletic prowess were highly valued. For example, in ancient Greece, physical fitness was an integral part of the education system, and athletes competed in events like the Olympic Games. Additionally, ancient Chinese cultures also placed importance on fitness, with evidence of early sports competitions and physical activities.
During the modern era, the concept of organized fitness programs and exercise for health and well-being gained prominence. In the 20th century, Kenneth Cooper's research on aerobic exercise led to the popularization of the concept of fitness as a means of preserving health. Today, the interest in fitness continues to grow with advancements in sports science, exercise physiology, and the increasing awareness of the importance of physical activity for overall health.