Cold water therapy is a technique often used by athletes and individuals to reduce muscle soreness and reduce recovery time after exercise. Regular use can reduce inflammation which can benefit individuals with chronic inflammatory conditions such as arthritis. It can also stimulate blood flow and improve circulation. There is widespread anecdotal evidence that suggests that cold water immersion can boost the immune system. Many people report feeling healthier and less prone to illness after regularly taking ice tubs. While the immune system is complex and difficult to study, it is believed that the cold can help to adapt and harden the body to disease and infection. Despite the lack of robust scientific studies on this topic, many people believe in the immune-boosting benefits of cold water immersion.