New Yorkers know how to brave the cold. Five inches of snow? Twenty-mile-per-hour winds? The challenges are met with a shrug, a grimace and an extra layer. Here, life keeps moving no matter the weather. I try to remember this as I’m standing before Forbes Travel Guide’s Four-Star The Spa by Equinox Hotels’ cryotherapy chamber, but find, faced with three minutes in a negative 150-degree chamber, my mask of Manhattan blasé is slipping.