Cold plunge and ice baths explained, with care

A cold plunge is a short sit in very cold water, usually a minute or two. The evidence for benefits is thin and mixed, the first minute is the risky one, and people with heart or circulation conditions should ask a doctor before they try.

What is a cold plunge?

It is a tub of cold water, often with ice in it, and you sit in it up to the chest or the neck. An ice bath is the same thing. Health sources suggest that beginners use water between about 10 and 15 degrees Celsius. That sounds mild. In a body that has spent the day at 30 degrees, it is not.

People do it after sport, as a morning habit, or as one half of a round of hot and cold. Many say they come out feeling awake and clear.

What does the evidence say?

Less than its fans say, and more than nothing.

In 2025 researchers at the University of South Australia gathered the controlled trials of cold water in healthy adults: 11 trials. This is what they found.

• Stress was lower twelve hours after the cold water. It was not lower straight away, or an hour later, or the next day.
• Mood did not improve in a way the trials could measure.
• Sleep was better in one small study, of men only.
• Feeling well in general was a little better after a month of cold showers. After three months the difference had faded.
• Sick days. In one large Dutch trial, about three thousand adults finished their warm shower with 30 to 90 seconds of cold for a month. They reported 29% fewer days off work for sickness. They were not ill on fewer days. They went to work anyway.

Almost all the people in that review came from the one Dutch shower trial, so it tells us more about a cold end to a shower than about a tub of ice.

What does it not show?

• That it calms inflammation in everyday life. In the review, markers of inflammation went up straight after the cold and an hour later.
• That it protects you from illness. The trials found no clear short-term change in the immune system.
• That it builds fitness. In a twelve-week study of 21 active men, ten minutes of cold water after each strength session led to smaller gains in muscle and strength than an easy warm-down did. A Cochrane review found that cold water eased muscle soreness after exercise better than rest, but called the studies small and of low quality. The Cleveland Clinic advises keeping a plunge at least four hours away from strength training.

The American Heart Association says it simply: the benefits are not established. What people reliably report is a feeling, awake and pleased with themselves, and that is a fair reason to do it carefully.

How do you do it carefully?

The body's first answer to cold water is called cold shock: a gasp you cannot stop, fast breathing, and a jump in heart rate and blood pressure. The first ten seconds to one minute are the most dangerous. Everything below follows from that.

• Never alone. Somebody stands beside the tub.
• Go in slowly, feet first. Do not jump, and keep your head above the water.
• Breathe out long and slow as you go in, and wait for the gasping to pass before you settle.
• Start short. The Cleveland Clinic suggests one to two minutes for a beginner, never more than five, and once or twice a week at first.
• Get out if you feel lightheaded, numb or unwell. Staying in longer wins nothing.
• Warm up gently afterwards. Dry off, put on dry clothes, drink something warm, and let the body come back by itself.
• Not when you are ill, and not after drinking alcohol.

Who should not, or should ask a doctor first?

Heart organisations and hospitals name the same groups. Do not plunge without your doctor's word if you have:

• Heart disease, or a heart rhythm problem such as atrial fibrillation
• High blood pressure
• Poor circulation, peripheral artery disease or Raynaud's
• Diabetes, or nerve damage in the hands or feet
• A pregnancy

People who take beta blockers should ask too. The American Heart Association notes that this medicine can change how the body gets used to cold. If you are not sure whether this list means you, it is a short question for a doctor. This is general information, not medical advice.

What about the cold plunge at Ohana?

Our cold plunge, an ice bath, starts in the middle of November 2026. It is a tub for four to six people at a time, kept cold with added ice. It costs 3,000 LKR per person for a group of at least four, booked together, because the ice is costly. We advise at least three minutes in the water, and never more than five. If you are new to the cold, build up to it with a minute or two, as above, and get out at once if you feel unwell. To book a plunge for your group, write to us on WhatsApp, +94 76 016 4768.

On this coast the sea is warm all year, so cold water is something you have to go and look for. A plunge after a morning class, then a slow breakfast in the sun, is one way to fit it into a day. We wrote such a day out in a wellness day by the sea. If your interest is the breathing that gets you through the first minute, start with breathwork for beginners, and please keep the fast breathing styles away from water.

Classes, sound and the rest of the week start from the page of our shala for yoga and wellness in Dikwella.

Good to know

• Our cold plunge starts in the middle of November 2026: 3,000 LKR per person for a group of at least four, booked together.
• Regular classes in the shala cost 4,000 LKR. Join any activity and you get 10% off the whole restaurant menu.
• No alcohol is served at Ohana. Filtered water is on the house.
• Breakfast is served from 08:00 to 11:00, lunch and dinner from 11:00 to 21:00.
• We are at Turtle Beach, Dikwella, less than five minutes by road from Hiriketiya.