For the wanna-be Rockette: New York Health & Racquet Club: This family-owned gym, which prides itself on its creative fitness classes, adds a new one to its West 23rd Street location in January. High Kicks, a complimentary group class taught by Rockette Barbi Powers, tones and tightens legs and butts with classic moves like toy-soldier marches and the famous kick lines. Attendees will learn barre choreography and can even bring nonmember friends ($25). Relax postworkout in the club’s Turkish saunas and steam rooms, or with a massage.