By Fuentes, founder of Lanoviss — 23 September 2026. About the author.
A sauna after a workout is fine for most healthy adults if you time it right: finish your cool-down, drink some water, and go in once your breathing is back to normal — usually about 10 minutes after your last set. Then 10–15 minutes in a Finnish sauna is plenty; the only randomised trial used 15 minutes. Afterwards, replace about 1.5 litres of fluid for every kilogram of body weight you lost.
Below is what the post-exercise sauna studies actually found, how long to stay, how the answer changes after lifting versus cardio, and a short packing list for a gym sauna.
Is a sauna after a workout good for you?
The evidence is promising but small. One randomised trial found that adding 15 minutes of sauna to regular exercise lowered systolic blood pressure by 8 mmHg more than exercise alone, and two small athlete studies found performance gains. None of them show bigger muscles.
| Study | Who | Sauna protocol | What changed |
|---|---|---|---|
| Lee et al., 2022 (randomised) | 47 inactive adults, average age 49, each with at least one cardiovascular risk factor | 50 minutes of exercise 3× a week, then 15 minutes of Finnish sauna, for 8 weeks | Systolic blood pressure 8.0 mmHg lower than exercise alone; larger gains in cardiorespiratory fitness and a bigger drop in total cholesterol |
| Scoon et al., 2007 | 6 male distance runners | About 31 minutes in a humid sauna at 89.9 °C after training, roughly 13 times over 3 weeks | Run time to exhaustion up 32% (about 1.9% in a time trial); plasma volume up 7.1% |
| Ahokas et al., 2025 | 40 female team-sport athletes | 10 minutes of infrared sauna at 50 °C after training, 3× a week for 6 weeks | Jump height and peak power improved in the sauna group; no extra muscle growth |
Read these numbers for what they are. Six runners is a very small sample, and the blood-pressure trial studied sedentary people with risk factors, not athletes. The likely mechanism in the runners — more plasma volume from repeated heat exposure — is the same adaptation athletes chase with heat training. The Finnish researchers behind the 2022 trial described it as the first randomised controlled trial in sauna research (University of Jyväskylä), which tells you how young this evidence base is.
How long should you wait after a workout before the sauna?
Wait until your breathing has settled and you have had some water — for most people that is 5–10 minutes of cool-down. The reason is that exercise and sauna stress the same system. Ten minutes in a sauna alone raised average heart rate from 79 to 121 beats per minute in a 2026 study of 50 adults, and a single 30-minute sauna at 73 °C lowered systolic blood pressure from 137 to 130 mmHg in another study of 102 people.
After hard exercise your blood vessels are already wide open. Stack heat on top and blood pressure can dip further, which is when people feel light-headed standing up from the top bench. A short walk, a few stretches and 250–500 ml of water first make the transition gentler.
How long should a post-workout sauna last?
10–15 minutes in a traditional sauna at 80–90 °C is enough for most people, and 15 minutes is what the randomised trial used. If you are new to saunas, start at 5–8 minutes and add a couple of minutes per week.
The 31-minute sessions in the runner study were done by trained athletes who built up to it, in a humid room — not a starting point. Infrared cabins run cooler, so sessions run longer: 10 minutes at 50 °C in the 2025 athlete study, and 30 minutes at 35–50 °C in an earlier Finnish recovery study. We go through round lengths by temperature in How Long Should You Stay in a Sauna?, and the differences between room types in Sauna vs Banya vs Steam Room vs Infrared.
Is a sauna better after cardio or after lifting?
The evidence is stronger after endurance work. After heavy strength training, keep the sauna short or save it for the session before a rest day.
In a Finnish study comparing different workouts followed by a sauna, strength training plus sauna was the most fatiguing combination for neuromuscular performance, and the authors suggested a traditional sauna may not be advisable in the 24 hours before your next training session. Infrared looks gentler: a single post-exercise infrared session at 43.5 °C improved recovery of neuromuscular performance and reduced muscle soreness.
What about sauna before training? Heat raises heart rate and core temperature before you have lifted anything, so skip it before any session where performance matters.
How much water should you drink after a workout sauna?
Weigh yourself before training and after the sauna. Every kilogram lost is roughly a litre of sweat, and the American College of Sports Medicine says people who need to rehydrate quickly can drink about 1.5 litres of fluid per kilogram lost. Lose 0.8 kg across a workout and a sauna, and that is about 1.2 litres over the next few hours, not all at once.
A salty snack or an electrolyte drink helps you hold on to that water. Skip alcohol entirely: a review in The American Journal of Medicine links drinking during sauna bathing to low blood pressure, arrhythmia and sudden death, and a Finnish forensic study found that half of the people who died in saunas between 1990 and 2002 had been drinking. Those deaths are rare — fewer than 2 per 100,000 people a year — but alcohol is the one risk factor you control completely.
What should you bring to a gym sauna?
A bottle, two towels, flip-flops and something for your head cover almost everything:
- A water bottle of 750 ml to 1 litre, for between the workout and the sauna and after.
- Two towels: one to sit on — for hygiene, and because a wooden bench gets hot (thisisFINLAND) — and one to dry off. Our first-time etiquette guide covers the unwritten rules.
- Flip-flops for the wet floors between the shower and the sauna.
- A wool sauna hat. Gym saunas are often small, with the top bench close to the ceiling, where the air is hottest. A felt hat insulates your scalp and ears from that layer. Skip polyester beanies: synthetic fibre holds damp against your head (we compared the fibres here). The Lanoviss merino wool sauna hat is 3 mm pressed felt, folds flat into a gym bag and costs $59.99 CAD.
- An electrolyte drink or salty snack for afterwards.
- A clean change of clothes. Don't sit in the sauna in sweaty gym kit; shower first and go in with a towel.
"So happy I bought this sauna hat!, the material feels sturdy, it arrived fast, definitely buy again!"
— Patricia, verified Etsy buyer, Jul 2026
When should you skip the sauna after a workout?
Skip it if you already feel unwell from the workout. The CDC lists heavy sweating, dizziness, headache, nausea, weakness and fainting as warning signs of heat exhaustion (CDC); a sauna only adds heat.
Also skip it after drinking alcohol, and talk to your doctor first if you have a heart condition. The American Journal of Medicine review lists unstable angina, a recent heart attack and severe aortic stenosis as reasons not to use a sauna, while noting it is safe for most people with stable coronary heart disease.
Frequently asked questions
Should you use a sauna before or after a workout?
After. Heat raises your heart rate and core temperature before you have started, and a Finnish study found sauna added to training fatigue. Save it for after your cool-down, or for a rest day if performance in your next session matters.
How long after a workout should you wait before going in the sauna?
About 5–10 minutes: long enough to cool down, drink 250–500 ml of water and let your breathing return to normal. Going straight from a hard set into the heat makes light-headedness more likely.
Does a sauna after a workout help build muscle?
Not on current evidence. A 2025 study of 40 female athletes using infrared sauna after training three times a week for six weeks found improved jump height and peak power, but no extra muscle growth compared with training alone.
Does a sauna after a workout help you lose weight?
The weight you lose in a sauna is water, and it comes back when you rehydrate — which you should do. The American College of Sports Medicine suggests about 1.5 litres of fluid per kilogram lost when rehydrating quickly.
Is it OK to use the sauna after every workout?
For healthy adults, regular post-workout sauna appears safe. The randomised trial used 15 minutes after each of three weekly workouts for eight weeks. After heavy lifting, keep it short, and skip it if you feel dizzy or unwell.
How long should a sauna be after the gym?
10–15 minutes in a traditional sauna at 80–90 °C, or 5–8 minutes if you are new. Infrared cabins are cooler, and studies used 10–30 minutes at 35–50 °C.
Sources
- Lee E, et al. "Effects of regular sauna bathing in conjunction with exercise on cardiovascular function: a multi-arm, randomized controlled trial." American Journal of Physiology – Regulatory, Integrative and Comparative Physiology, 2022. APS · PubMed
- Scoon GS, et al. "Effect of post-exercise sauna bathing on the endurance performance of competitive male runners." Journal of Science and Medicine in Sport, 2007. PubMed
- Ahokas EK, et al. "Effects of repeated use of post-exercise infrared sauna on neuromuscular performance and muscle hypertrophy," 2025. PubMed
- Ahokas EK, et al. "A post-exercise infrared sauna session improves recovery of neuromuscular performance and muscle soreness after resistance exercise training." PubMed
- Mero A, et al. "Effects of far-infrared sauna bathing on recovery from strength and endurance training sessions in men." SpringerPlus, 2015. PMC
- Rissanen JA, et al. "Acute neuromuscular and hormonal responses to different exercise loadings followed by a sauna." PubMed
- Laatikainen-Raussi I, et al. "Temperature and humidity independently influence thermoregulatory responses during Finnish sauna bathing." Temperature, 2026. University of Jyväskylä release
- Laukkanen T, et al. "Acute effects of sauna bathing on cardiovascular function." Journal of Human Hypertension, 2018. Nature
- Sawka MN, et al. "American College of Sports Medicine position stand. Exercise and fluid replacement." Medicine & Science in Sports & Exercise, 2007. PubMed
- Hannuksela ML, Ellahham S. "Benefits and risks of sauna bathing." The American Journal of Medicine, 2001. amjmed.com
- Kenttämies A, Karkola K. "Death in sauna." Journal of Forensic Sciences, 2008. PubMed
This article summarises published research for general information. It is not medical or training advice. If you have a heart condition, high or low blood pressure, or are pregnant, ask your doctor before using a sauna.