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Science says the sauna can elevate heart rate like a workout, but peak fitness still depends on pairing heat with hard training
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You’ve probably seen the headlines claiming that a sauna session can benefit the body almost as much as exercise. It sounds like the ultimate wellness shortcut: sit back, sweat it out and skip the gym entirely. Before trading sneakers for a towel though, the science behind the hype deserves a closer look.
Much of the conversation began with a study published in Complementary Therapies in Medicine. German researchers tracked 19 volunteers to measure the immediate effects of sauna use on the cardiovascular system. The findings were unexpectedly compelling. A 25-minute sauna session produced a physiological response comparable to a short, moderate ride on a stationary bike.
The intense heat caused both blood pressure and heart rate to rise gradually before returning to baseline once the session ended. Researchers observed the same pattern when participants cycled against a 60-to-100-watt load on an exercise bike. In simple terms, the heart responds as though it has completed a light workout.
That naturally raises the obvious question: can regular sauna sessions replace exercise altogether? Not quite. While saunas may support cardiovascular health, heat alone does little for muscle development or functional fitness. “A sauna session is a physical strain and its long-term positive effects for the heart are similar to sports activities. But with no muscle activity, it won’t be the same as doing exercise,” explained lead researcher Sascha Ketelhut, PD Dr. of Martin Luther University Halle-Wittenberg.
Andy Galpin, professor and Executive Director of the Human Performance Centre, echoes that view. For individuals who are sedentary or living with mobility limitations, sauna use can offer meaningful health benefits. The issue begins when the hot room is marketed as a legitimate substitute for exercise itself. Current epidemiological evidence simply does not support the idea that sitting in a sauna delivers better fitness outcomes than cardio training or structured physical activity.
Ultimately, the two practices serve very different purposes. Sauna culture is rooted in therapy and recovery. Heat exposure helps lower stress hormones such as cortisol, improves circulation and supports muscle recovery after intense training. Cardio training, by contrast, is active physical work designed to build endurance and functional capacity. Exercise burns more calories, promotes fat loss, strengthens skeletal muscles and develops long-term stamina.
The smartest approach is not choosing one over the other but understanding how each fits into a broader performance routine. For goals like fat loss, muscle definition and endurance, structured training remains essential whether through weightlifting, running or high-intensity conditioning. Saunas work best as a complement to that effort, particularly for stress reduction, muscle relaxation and joint relief.
One of the easiest ways to integrate sauna use is as a post-workout ritual. After an intense lifting session or demanding cardio workout, muscles are fatigued and tight. Spending 15 to 20 minutes in the heat can help soothe soreness, reduce next-day stiffness and support recovery. It also works remarkably well as an evening routine, especially for runners. The heat helps downregulate the nervous system, making it easier to transition into deeper, more restorative sleep that aids tissue repair overnight.
Saunas can also become particularly valuable during injury recovery or de-load weeks. When training volume drops or high-impact exercise is temporarily off the table, heat exposure may help maintain cardiovascular conditioning. Elevated temperatures stimulate circulation and force the heart to work harder, creating a mild cardio-like effect without placing additional mechanical stress on the joints.
That support may help preserve aerobic capacity during recovery, making the eventual return to training smoother and more efficient. The takeaway is straightforward: the sauna is a powerful tool for overall wellness, but it works best alongside a proper fitness regimen rather than in place of one. Pair the heat with consistent hard work and the result is a more balanced, sustainable approach to long-term performance.
Photo Shutterstock/DavideAngelini

The science behind sauna benefits is real, but exercise still does more

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