This therapy consists in immersing the body for short periods of time in thermal water pools of different temperatures, going from hot to cold. The cycle starts with one of 41°C, followed by another one of 24°C, then one of 37°C and finally with one of 31°C. The recommended cycle is the following: First round of 1 to 10 minutes maximum in each pool and two direct rounds of 1 to 5 minutes maximum in the 41°C and 24°C pools.