I am a serious practitioner of Parkour. I train at least 4 times a week, and push myself pretty hard.
I am not a performer I just enjoy the art, movement and the level of fitness required to even achieve a basic level of ease when running/climbing over obstacles. As a result of my training, I occasionally injure myself. I had sore knees last summer, got a sprained ankle earlier this year, and am currently contending with a strained rotator cuff and trapezius muscle with a pinched nerve in there somewhere. My entire right arm, all the way to my finger tips is constantly tingling and sometimes numb. It’s been like that for more than a month.
I was doing probably too many dips when my right arm collapsed. A few days after this happened, the pain was excruciating. I could not stand up with out grimacing and hunching over. I got acupuncture, various kinds of massage and even cupping! That helped a lot. But what really helped was ice. I iced nearly every night for three weeks. It kept the pain down, it felt great and it sped up the healing process.
My trainers/coaches always told me “Ice and rest”. I ignored them on both counts until this injury. And only now, I am resting my right arm and the healing is picking up even more.
I came across a bizarre article in the NYTimes about Whole Body Cryotherapy (WBC). There have been times where a bed of ice would have felt pretty great some nights after training but the temperatures involved with cryotherapy get down to around -110o F! There is no natural temperature like that on the planet!! Athletes stay in this chamber for only 2 – 3 minutes at a time, waving their limbs around in order to keep the blood flowing.
There have been conflicting clinical studies about this but professional athletes seem to enjoy it. 
WBC can also be dangerous. If any article of clothing is even a little damp going into the cryo-chamber, that area of the body will get frost bitten.
I don’t think I’d ever do cryotherapy for injury, but perhaps this will simultaneously help us gain insight into how to freeze the body for deep space shipping
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