GoCryo, San Diego

For generations, athletes have been soaking their weary bodies in tubs of ice, but this age-old technique gets a modern upgrade at Nextgen Cryo. At Nextgen, they offer a service known as cryotherapy, a treatment in which clients step into a CryoSauna that quickly cools the whole body to temperatures plunging as low as -167°F using fast-acting nitrogen vapor. This shock of cold acts as a jolt to the body's central immune system, quick-starting it into working to a faster recovery. The process has also been known to restore elasticity to the skin and even boost clients' metabolisms, helping them burn unwanted calories.