Some athletes use a technique known as contrast water therapy or contrast bath therapy, in which cold water and warmer water are alternated. Evidence supporting cold water immersion as part of an athletic training regimen remains inconclusive, with some studies suggesting a mild benefit such as reducing muscle damage and discomfort and alleviating delayed onset muscle soreness, with other studies suggesting that cold water immersion may slow muscle growth and interfere with an overall training regimen. Many athletes have used cold water immersion after an intense exercise workout in the belief that it speeds up bodily recovery however, the internal physical processes are not well understood and remain elusive. While it is becoming increasingly popular and accepted among athletes in a variety of sports, the method is controversial, with a risk of hypothermia, with the possibility of shock leading to sudden death. In sports therapy, an ice bath, or sometimes cold-water immersion or cold therapy, is a training regimen usually following a period of intense exercise in which a substantial part of a human body is immersed in a bath of ice or ice-water for a limited duration. Champion weightlifter Karyn Marshall taking an ice bath after the Crossfit Games in 2011.

Body heat movie tub