Bradley Cooper, Irina Shayk/Splash
Actor and director Bradley Cooper recently revealed to the New York Times that he dives into a frozen pool "every morning when I get up."
In the photo taken alongside the article, the star of the "Maestro" - floating in a stream on a snowy day wearing only shorts - and it is written that he likes "to swim in freezing temperatures".
And he is not alone.
For years, celebrities and athletes alike, including Justin Bieber, have been talking about using ice water immersion to boost muscle recovery.
The Wim Hof Method, created by Dutch extreme athlete Wim Hof, also employed cold therapy as a way to increase focus, increase energy and reduce stress levels.
There are also those who say that they increase libido.
The practice has become relatively mainstream, as social media has embraced it and even shown people purchasing ice baths for their backyards to incorporate cold immersion into their daily routine.
Some spas and gyms have these pools.
But does the strengthening of the trend really mean that this is a healthy thing?
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Ice water immersion is a practice of cold therapy that involves full or partial immersion in water below 50 degrees Celsius for a short period of time.
Andrew Jaggs, director of sports medicine research at the Mayo Clinic Health System, told Yahoo Life that the immersion can be continuous or done in several alternating dives.
Most people start with 30 seconds.
"It is common among athletes or fitness enthusiasts to start the day by diving in an ice bath, with the intention of improving muscle recovery," he says.
Immersion in an ice bath is said to improve muscle recovery by inducing what Jagim calls "a state of vasoconstriction, where blood vessels constrict rapidly to redirect blood flow to major organs."
In doing so, it can limit post-workout muscle inflammation.
However, not only people who engage in intense physical activity participate in cold immersion therapy.
Jagim says he's seen claims that frozen pools helped treat symptoms of chronic pain or led to "improvements in mood and increased resistance to stress, which can help immune system function."
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Bradley Cooper
ice
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immune system