How Contrast Therapy Works (and How to Do Your First Session)

Last reviewed November 2026

Quick answer: Contrast therapy means alternating heat (a sauna, steam room or hot tub) with cold (a cold plunge, cold pool or cold shower), with rest in between. A common beginner session is three rounds: 10–15 minutes of heat, 1–2 minutes of cold, then a few minutes of rest. Many people end on cold. It's an old practice: Finnish saunas, Russian banyas and Roman baths all paired hot with cold. Today there are dedicated studios built around it.

What happens in your body

Heat makes your blood vessels widen and your heart rate rise, as if you'd gone for an easy walk. Cold does the opposite. Vessels tighten, your breathing catches for a moment, and your body releases a rush of stress hormones that leaves many people feeling alert and clear-headed. Going back and forth between the two is the "contrast."

People do it for the way it feels: relaxed and awake at once, and often sleepier at night. The research on specific health benefits is still early and mixed. ThermAtlas is a directory, not a doctor, so treat contrast therapy as a ritual you enjoy rather than a treatment. Check with your doctor first if you're pregnant, have a heart condition or high blood pressure, or take medication that affects your heart or circulation.

A first session, step by step

  1. Hydrate and eat lightly. Drink water beforehand. Skip alcohol before and during.
  2. Rinse off. Most places ask you to shower before the heat.
  3. Heat: 10–15 minutes. Sit on a lower bench if you're new, since heat rises. Get out when you've had enough. There's no prize for staying longest.
  4. Cold: 30 seconds to 2 minutes. Get in slowly and breathe out long and steady. The first 30 seconds are the hardest, then it gets easier. Keep your head above water unless the facility says otherwise.
  5. Rest: 5–10 minutes. Sit or lie down and let your body warm up on its own. Many people find this the best part.
  6. Repeat 2–4 times. Three rounds is a good first session. A full visit usually takes an hour to an hour and a half.

Hot or cold last? Ending on cold leaves you feeling alert and lets your body warm itself back up. Ending on heat is cozier, especially in winter. Both are fine. Many Nordic and banya traditions end on cold and then rest.

Typical temperatures

Across ThermAtlas listings, the median temperatures are:

  • Traditional sauna: about 175°F
  • Infrared sauna: about 140°F (it heats you more directly, so the air doesn't need to be as hot)
  • Steam room: about 115°F, near 100% humidity
  • Hot tub: about 104°F
  • Cold plunge: about 45–50°F

New to cold? Look for water in the 50–59°F range. That's warmer than many plunge tubs, so ask the staff, or start in a cold pool. See Cold Plunge Temperatures Explained.

Safety basics

  • Don't plunge alone, and don't plunge after drinking.
  • Get out of the cold if you start shivering hard, feel numb, or feel dizzy.
  • Stand up slowly after the heat. Feeling light-headed is common.
  • Stop and rest if your heart is pounding or you feel unwell.
  • Listen to the staff. Guided studios often coach your breathing through the cold.

Ways to do it

  • Contrast studios: modern studios built around sauna plus plunge. You book a time slot, often in a private suite or a small group.
  • Community saunas: shared saunas, often outdoors, with plunges or a lake nearby. Social, affordable and usually walk-in friendly.
  • Bathhouses and Korean spas: several heat rooms plus a cold pool, for as long as you like.
  • Guided sessions: some studios run coached rounds with breathwork. They're good if you want structure for your first time.

Where to try it

Every ThermAtlas city page answers "Where can I do contrast therapy?" with places that have both heat and cold. A few to start with:

Common questions

How long should I stay in the sauna before a cold plunge?
For most people, 10–15 minutes, or until you feel properly warm. Get out sooner if you feel light-headed.

How long should I stay in a cold plunge?
Thirty seconds to two minutes is plenty when you're starting out. Colder water calls for less time.

How many rounds of contrast therapy should I do?
Two to four. Three is a common first session.

Is contrast therapy the same as a cold plunge?
No. A cold plunge is just the cold half. Contrast therapy alternates heat and cold with rest in between.

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