Who was The first researcher to scientifically demonstrate the relationship between the level of physical activity performed and heart disease?

The first researcher to scientifically demonstrate the relationship between physical activity and Heart disease was Dr. Jeremy Morris. In the 1950s, he conducted a study among London bus drivers and conductors, revealing that those who were more physically active had lower rates of coronary heart disease compared to their more sedentary colleagues. This groundbreaking work laid the foundation for the understanding of the role of physical activity in cardiovascular health.