You might see "Motown" or "80s" on the schedule, but InSync Cycle Studio is not a dance venue. These events still involve plenty of legwork, though—students pedal aboard stationary bikes as invigorating music blares all the while. During these sessions, they'll surmount imaginary hills with real resistance, or zoom through long straightaways at high speeds. Some might be marathoners, and others might be first-timers. It doesn't matter to the instructor at the head of the class, who makes sure that everyone's workout is suited to their experience.

Typically, these instructors are the ones in charge of the music. Most classes aren't themed, but follow a mix of tunes that mesh with the teacher's taste. Some will even time the rhythm of their inclines and sprints to match the song, which is why "Flight of the Bumblebee" has been banned forever. Regardless of the soundtrack, each low-impact lesson helps to tone muscle and build endurance in a communal, encouraging space.