Sauna Before or After Workout: What's Actually Better
Updated February 2025 — Backyard Sauna Pro
The honest answer is: after, for most people and most goals. Post-workout sauna use has meaningful evidence behind it. Pre-workout sauna has benefits too, but they come with real performance tradeoffs. Here is what the research shows and how to use both approaches effectively.
After a Workout: The Case For
Muscle recovery
Heat increases blood flow to muscles, helps clear metabolic waste products from exercise, and reduces delayed onset muscle soreness (DOMS). Multiple studies have shown post-exercise heat exposure — sauna or heat therapy — meaningfully reduces soreness 24-72 hours after training. For people training hard and frequently, this is the main reason to sauna after workouts.
Extended cardiovascular benefit
A sauna after exercise extends elevated heart rate for another 15-20 minutes. Research from the University of Eastern Finland found that men who combined exercise and regular sauna use had significantly lower all-cause mortality than men who only exercised. The combination appears to compound the cardiovascular benefit.
Growth hormone
Heat stress independently triggers growth hormone release. Combined with the post-exercise GH response, a post-workout sauna session produces a significantly higher GH spike than either alone. Practically, this supports muscle repair and recovery.
How to Do Post-Workout Sauna Right
- Wait 10-15 minutes after finishing exercise before entering. Your core temperature is already high from training — give it a brief chance to stabilize.
- Drink 16-24 oz of water before getting in. You are already dehydrated from training.
- 15-20 minutes is the target session length. Longer is not necessarily better when already fatigued.
- Finish with a cool shower or cold plunge if available. The contrast accelerates the recovery process further. See our sauna and cold plunge guide.
Before a Workout: The Case For (and Against)
Potential benefits
A short pre-workout sauna session (10-15 minutes at moderate temperature) warms connective tissue and increases range of motion. Some athletes find it useful for dynamic flexibility work or before activities where mobility matters. There is also a mental component — the sauna ritual can be a useful part of getting focused before training.
The tradeoffs
Heat exposure before training depletes glycogen, raises core temperature, and causes fluid loss. All three hurt performance — strength output drops when core temperature is too high, endurance capacity decreases with dehydration, and starting a workout glycogen-depleted reduces training quality. For anyone training seriously, the performance cost of pre-workout sauna typically outweighs the flexibility benefit. Short sessions at lower temperatures minimize the damage but the tradeoff rarely favors pre-workout use for performance-focused training.
The Verdict
If your goal is recovery and general health: after training, 15-20 minutes, well hydrated. This is the evidence-backed approach with the best return.
If your goal is performance: save the sauna for post-workout. Pre-workout sauna costs you output.
If you want to use sauna for flexibility: a short, moderate pre-workout session is fine for light training days. Avoid it before heavy strength sessions or intense cardio.
FAQ
Should you use a sauna before or after a workout?
After for most goals. Post-workout sauna aids recovery, extends cardiovascular benefit, and supports muscle repair. Pre-workout sauna hurts performance due to dehydration and elevated core temperature.
How long should you stay in a sauna after a workout?
15-20 minutes. Wait 10-15 minutes after finishing exercise before entering. Drink water before going in.
Is it OK to sauna before working out?
For light training days and flexibility work, a short moderate session is fine. Avoid before heavy strength or endurance sessions — the performance cost is real.