The workout: AKT in Motion
The devotees: Kelly Ripa, Shakira, Sarah Jessica Parker, Drew Barrymore, Hilary Duff, Karlie Kloss
The details: If you have a hard time deciding between circuit training, HIIT, strength training, dance cardio, Pilates and yoga, then Anna Kaiser’s AKT in Motion might be the ideal fitness solution for you. There’s no yelling and classes are revamped every two to four weeks to keep workouts challenging—but AKT boasts a “torture-free” environment so although you may be a bit sore the next day, you should still be able to sit down and stand up. In addition to studios in New York City, East Hampton, Connecticut and Los Angeles, AKT offers “on demand” subscriptions so you can stay fit anytime and anyplace.