One day you’re cycling at Zengo Cycle, the next you’re training at Tough Temple CrossFit, and the next you’re throwing jabs at a punching bag at Bethesda Boxing & Kickboxing Academy. That’s the idea behind ClassPass, a pay-by-the-month ($109), cancel-anytime membership that gives participants unlimited workouts at thousands of gyms across the nation, including 30-plus in Montgomery County. Use the website to sign up for classes—yoga, Pilates, cardio kickboxing, strength training and more. The only restriction is that you can’t go to the same gym more than three times a month. Otherwise, the program is an exercise in flexibility, enabling easy access to often pricey, commitment-required studios.