THURSDAY

SoulCycle: Spin along to break-up songs at 8:30 a.m., followed by make-up songs at 9:30 a.m. $34 ($20 first time ride). 140 E. 63rd St. Info and registration: Soul-cycle.com

Whipped: "Fifty Shades of Grey"-themed Crunch fitness class taught by a dominatrix in black leather boots to "whip" you into shape. 7:30 p.m., open to memberships and first-time nonmembers with a daypass. 215 W. 23rd St. Info: Crunch.com

FRIDAY

Valentine's Day Love Cycle Mixer: Both singles and couples are welcome to this Swerve Fitness class, with champagne and pink smoothies to follow. 7:30 p.m., $30. 30 W. 18th St. Info and registration: Swervefitness.com

SATURDAY

Heart-Opening Yoga Session: Class will emphasize poses that open the heart. 9-10:30 a.m., FREE. Story, 144 10th Ave. Info and registration: Thisisstory.com

SoulCycle: Beyonce and Jay Z-themed spin class. 5 p.m., $34 ($20 first time ride). 140 E. 63rd St. Info and registration: Soul-cycle.com

Yoga For Better Sex: A 60-minute class followed by couples Thai massage workshop. 5:30-7 p.m., $70 (for two). ((305)) Fitness, 18 W. Eighth St. Info and registration: Bit.ly/305fitness

Me, Myself and I: All the single ladies are invited to this cardio class, following by spa-style pampering. 7-9 p.m., $45. ((305)) Fitness, 18 W. Eighth St. Info and registration: Bit.ly/305fitness

50 Shades of Sore: SLT instructors will lead classes through the best moves for better sex during the workout. All day, $40 ($20 first-class special). Multiple locations. Info and registration: Sltnyc.com