New research has shown that whirlpools (hot tubs) raise the body's core temperature more effectively than traditional or infrared saunas, leading to a significant increase in blood flow and activation of the immune system. Immersion in hot water caused measurable changes in inflammatory markers that may persist after the bath, suggesting a lasting health benefit. Thus, heat therapy in a hot tub may be an effective alternative for people who cannot or do not want to exercise. Hot tubs also help to relax muscles, reduce tension, promote healing of injuries and improve psychological well-being. Regular use of hot tubs has been linked to improvements in cardiovascular markers such as lower blood pressure and better glycemic control in patients with type 2 diabetes. In addition, whirlpools stimulate white blood cell production and reduce levels of the stress hormone cortisol, thereby boosting immunity. Hydrotherapy in whirlpools is thus a comprehensive therapy with a positive impact on physical and mental health[1][2][3].