Cold water immersion, also known as a cold plunge or cryotherapy, is a therapeutic practice that involves briefly immersing oneself in cold water. The practice constricts blood vessels, and when you exit the plunge, they dilate, which improves circulation and reduces inflammation. The benefits of cold water immersion include muscle recovery, improved circulation, a potential boost to the immune system, stress reduction, and increased mental resilience. Additionally, the controlled stress of the cold plunge can also help you manage overall stress levels and build mental resilience.