Big chains Soul Cycle and Flywheel made their way to Boston during the past year, but homegrown studio the Handle Bar offers its own spin on the trend, with cycling classes that are intense, personalized and—dare we say it—fun. Customization is key. Rides are synchronized to music with mood lighting, and each instructor chooses the vibe. If you’re not as fit as your fellow riders, never fear; you can control the bike’s intensity using a resistance knob. Insiders recommend scheduling a class with Elise Petersen, Lena Rakijian, Sarah Maguire or Cara Tramontozzi, the Handle Bar’s most-followed instructors.