Ice baths have been popular forms of recovery in recent years. From athletes to people who work out casually, they are used to ease the aches and pains of exerting your body. However, studies are starting to show that hot tub soaks can be more beneficial. While both offer their own version of relief, there are some distinct differences. Let’s delve into why choosing a hot tub for your post workout recovery routine is optimal.
The Cold vs Hot Debate
The ice bath has been the go-to for post workout recovery for years. Plunging into freezing water has been seen as the ultimate way to fight soreness and inflammation. And there is truth to that – cold water immersion can reduce inflammation, muscle soreness, and fatigue.
However, using cold water therapy too much could affect the body’s natural adaption process. When you cool your muscles immediately after exercise, the signals that trigger growth and adaptation can be suppressed. This means that you may not be able to build strength or endurance over time.
That’s where hot water immersion comes in. The warmer, more relaxing counterpart to cold plunges. Instead of numbing the body’s response, heat enhances it. Immersing in warm water between 38ºC – 40ºC expands the blood vessels and boosts circulation. This helps deliver oxygen and nutrients to tired muscles and carry metabolic waste away.
Research also suggests that heat exposure calms the body and aids recovery. Over time, it can even promote greater cardiovascular adaptation. This improves endurance and blood-flow during future workouts.
A 2025 review in Current Sports Medicine Reports highlighted that both cold and heat have benefits but serve different goals. Cold exposure is best for immediate recovery and inflammation management, while heat immersion is beneficial for ongoing adaptation, circulation, and relaxation. Context matters – ice baths are great for quick relief, but hot tub soaks can boost long-term performance gains.
The Study: Hot Water Beats Cold for Post-Workout Performance
A new study presented at the American Physiological Society’s 2024 Integrative Physiology of Exercise conference brought a lot of attention to the debate over ice versus heat. The research compared hot water immersion to cold water immersion after high-intensity exercise, and the results were surprising.
In the experiment, recreationally active men completed about 50 minutes of interval running, followed by one of three recovery strategies:
- A hot water soak at approximately 40ºC,
- A cold-water plunge at approximately 15ºC, or
- Simply sitting still as a control.
The participants were then tested one hour later and the results showed that those who soaked in hot water maintained their jumping performances while those in cold water saw a clear decline.
The conclusion was that hot water immersion may help athletes preserve short-term performance. This echoes what many people say: the warmth of a hot tub soak relaxes the body without affecting performance while cold plunges can leave muscles feeling switched off and stiff.
Hot Tub Soak Benefits: More than Exercise
The above study isn’t the only thing that points to the benefits of warm-water recovery. Many different trials are showing that regular post-exercise heat exposure can enhance both performance and overall health – even for people who aren’t elite athletes.
The appeal of hot soaks extends beyond these people. In a 2025 study from Cardiff Metropolitan University, researchers examined middle-aged adults who completed moderate exercise followed by 40ºC baths several times a week for eight weeks. The hot water group showed lower blood pressure and better vascular function. This suggests that even for everyday exercisers, heat can improve cardiovascular health.
Finally, the 2025 review in Current Sports Medicine Reports reinforced that thermal therapy is versatile. It stated that hot water immersion may accelerate blood flow recovery, promote relaxation, and improve muscle function, especially when used as part of a balanced recovery routine that also includes adequate rest, hydration, and nutrition.
Hot tub soaks are more than just a relaxing reward – they’re a recovery strategy backed by science. Whether you are a competitive athlete or just trying to stay consistent at the gym, adding a warm soak after workouts could improve circulation, support cardiovascular health, and even enhance performance over time.
