Sauna time is one of those wellness habits where the feeling can be stronger than the evidence. Heat exposure clearly raises heart rate and body temperature, but that does not automatically mean it works like exercise or that every claimed benefit comes from the sauna itself. Some findings are promising, especially around cardiovascular adaptation and recovery, yet many observations are based on association, small studies, or specific groups rather than broad, long-term proof.
The biggest practical issue is not the exact โbestโ minute mark so much as tolerance. Session length is shaped by heat level, humidity, hydration, prior exercise, sleep, medications, and personal heat sensitivity. A fitter person may tolerate more, but fitness is not a guarantee of safety. Heat strain can build quickly, and feeling โfineโ at first does not always predict how the body will respond five minutes later.
For active people, the sauna is better viewed as a recovery or relaxation tool than a substitute for training. It may support a post-workout routine by encouraging downregulation and consistent recovery habits, but it should not be treated as a shortcut for conditioning or a medical intervention. If a claimed benefit depends on very specific protocols, that makes general advice harder to apply in real life.
The most evidence-informed approach is conservative and repeatable: stay attentive to dizziness, nausea, pounding heartbeat, or confusion, and step out early if any of these appear. The useful question is often less โHow long should I last?โ and more โHow can I use heat in a way that is safe, sustainable, and actually fits my routine?โ
Sauna Benefits
A sauna can be a treat for those that love the heat and a challenging endurance test for those that donโt. โIn my experience, the benefits of the traditional Finnish sauna are profound,โ says Michal Cohen-Sagi, founder ofย longevity and biohacking circuit Vidavii. โItโs one of the simplest and most powerful longevity practices that is deeply rooted in ancient tradition and easily accessible in the modern day. Regular sauna use can improve circulation and strengthen cardiovascular function. Some suggest that it can even help with reducing the risk of Alzheimerโs.โ A contrast therapy session is a great way to make the most of a sauna session in short bursts. โContrast therapy is a combination of hot and cold exposure, whereby you might move from a sauna into a cryotherapy chamber or a cold plunge,โ says Cohen-Sagi. โThis intense shift in temperature trains your blood vessels to contract and dilate efficiently, boosting circulation, reducing inflammation, and improving resilience. Itโs an incredible way to wake up the bodyโs natural healing systems and brain clarity and a kind of a reset.โFitness Levels and Sauna Use
How long you spend in a sauna, or any kind of hot or cold therapy, depends on your fitness level and your overall health. โThe fitter you areโand that doesnโt just mean strengthโyou will likely be able to better handle the heat,โ says Puck Alkemade, a researcher and physiologist with CORE, who has developed an innovative thermal performance monitor. A study at the Journal of Science and Medicine in Sport suggests that taking regular saunas can also help to improve fitness. โThis particular study examined how sauna bathing after exercise affects endurance performance in male distance runners,โ says Alkemade. โOver a three-week period, participants who used the sauna post-training saw significant improvements in their running performance, including increased time to exhaustion and enhanced blood volume, suggesting a beneficial adaptation for endurance athletes. Genetics may play a role in how one tolerates heat, but as humans we have an ability to adapt to our environment. If we are exposed to the heat more often, we will be able to endure it for longer.โEnjoyed this article? Sign up for our newsletter to receive regular insights and stay connected.