"The metal cryotherapy tanks found at Lincoln Park’s CryoBar are as futuristic as it gets—and be warned: the thought of being surrounded in a subzero fold of icy fog is a little daunting. But many regulars describe the enveloping cold as a surprisingly pleasant experience, which is meant to release endorphins and produce an anti-inflammatory response that can reduce pain and increase your metabolism. It’s also said to encourage a great night’s sleep. It’s an easy, quick process: Step inside, remove your robe, and after three minutes, you emerge with a body that feels rested and recharged. "