What are the reasons swimming nearly vanished from society for hundreds of years?

Swimming nearly vanished from society for hundreds of years due to several factors, including the rise of organized religion, which often deemed public bathing as immoral or sinful. Additionally, the spread of diseases in the Middle Ages led to a fear of water and bathing, resulting in a decline in swimming practices. The focus on land-based sports and the changing societal norms regarding fitness and leisure further contributed to swimming's decline until it was revived in the 19th century.