WHETHER it's AFL, cricket, rugby league or many other team sports, you'll see them after most matches.
You'll also see elite – even semi-elite – runners, cyclists and rowers use them too.
Ice baths. Dreaded by some and lauded by others as a way to recover quicker and more efficiently from a hard training session or game.
But are they really essential to help players get the best out of themselves?
Demon Jordan Lewis feels the post-match chill. All pictures: AFL Photos
Since the late 1970s, conventional wisdom has dictated athletes cover the muscles they've just used in ice.
By slowing blood flow, the theory goes, ice reduces inflammation and pain, promoting recovery.
The most extreme version of this is the ice bath, where you jump into waist-deep water at a frigid 10-15 degrees Celsius.
After a 40-year reign, enthusiasm is cooling for the ice bath
A growing body of scientific evidence is raising questions over whether icing is actually an effective method for recovery after exercise.
In science journalist Christie Aschwanden's new book 'Good to Go: What the Athlete in All of Us Can Learn from the Strange Science of Recovery', she investigates a huge range of recovery methods.
Instead of promoting healing and recovery, icing might actually impair it."
When it comes to ice, Aschwanden is about as glowing as she is with more 'fringe' recovery methods like floating chambers, NormaTec boots and cryotherapy. Which is to say, not very.
Have ice baths, will travel: Giants Matt Buntine, Zac Williams and Tom Downie take the DIY approach in this 2015 session.
"Instead of promoting healing and recovery, icing might actually impair it," Aschwanden writes.
The evidence, she says, is stacking up against the popular use for the past four decades, and suggests the body is better left to repair itself over time.
Is icing muscles doing more harm than good?
A prominent physician lending weight to the argument against ice is Gabe Mirkin.
It was Mirkin who in 1978 coined the acronym RICE (rest, ice, compression, elevation), a rubric for rehab that will be instantly familiar to athletes of all levels, and has also been adopted for post-workout recovery.
Now, Mirkin has joined the chorus of scientists believing icing can be counterproductive for recovery after exercise.
By slowing blood flow, Mirkin says, ice actually inhibits rebuilding of muscle and the restoration process.
He's backed by a 2013 study published in the American Journal of Sports Medicine, which showed that although cooling or icing delayed swelling, it did not hasten recovery from muscle damage.
And here's the significant point - inflammation is part of the healing process.
In much the same way your body uses immunity to kill germs, it uses inflammatory cells to rush to damaged muscles to promote healing. In restricting the blood flow, ice inhibits those healing cells from doing their work.
Mirkin says ice can be used to numb pain, but should only be applied once or twice for 10-minute bursts following injury – or a game - and there is absolutely no reason to apply it more than six hours afterwards.
So how useful are those next-day ice baths or walks into the surf?
Exercise physiologist Jonathan Peake tested groups with resistance training at the Queensland University of Technology. He found those that did a light warm down gained much more muscle than those that took ice baths.
Again, he found icing suppressed the cell-signaling that regulated muscle growth.
"It shouldn't be used after every training session," Peake says.
"If you're trying to get maximum adaption, cold water immersion is not going to be beneficial."
"But if you're in a play-off phase of the season, icing isn't going to be too harmful and might have some psychological benefits, even if it's all just placebo effect."
If it feels good ... the Suns are regulars in the much warmer Queensland surf
And that's the aspect that makes this topic so complicated.
Speak to many players and they'll say they feel better after an ice bath, and if they feel better, it's likely they'll perform better next time out.
It's a point professor of exercise science at Auburn University David Pascoe agrees with, saying the benefits of icing depend on your workout goal.
If it's to develop muscle, then no, but if it's to feel good - and because of it the next day you perform better - then icing after exercise may still be worth your while.
If you're trying to get a definitive answer on the value of ice and ice baths as a form of recovery, you might not get it here, but in sports science circles, the debate is set to continue.
And the ultimate recovery tool?
After running the rule over a multitude of methods in her book, Aschwanden – a former elite Nordic skier – says: it's sleep.