CryoMKE.COM, Bayside

Up until a few years ago, if you wanted to slow aging and reduce pain with sub-zero temperatures, you'd either have to endure a two-hour ice bath or spend the next several hundred years frozen inside a glacier. Today, thanks to spas like CryoVive Cryotherapy, it only takes about three minutes.

Here, folks looking to speed muscle recovery, reduce cellulite, or just burn calories take the plunge. Pods deploy nitrogen, safely cooling skin temps by up to 50 degrees and spurring on the body's own healing mechanisms. The process is so effective that even the Olympic Rehabilitation Center in Poland relies on it to get athletes up and running after injuries.