"While the gym and restaurant are open to members only, the spa at Chelsea's KX is open to the (well-heeled) public who might visit for a wax or face sculpting. We would recommend heading there for a functional medicine consultation with Dr. Georges Mouton. If colonics are your thing, see Michelle Laud. Not looking for a membership? KXU, a pay-as-you-go (and wallet-friendlier) model, opened on Pavilion Road; it may not have all bells and whistles that KX Life does but features an infrared sauna, a cryotherapy chamber, massages, and rose-gold-hued changing rooms. The easy-to-use app makes it easy to book on the fly, too."