Treadmill group classes are popping up all over the country. Boutique studios such as New York-based The Mile High Run Club and Barry’s Bootcamp (BBC) in San Diego, Calif., have introduced coached treadmill interval workouts as part of their programming. High-end big box gyms like Equinox and LifeTime Fitness also offer similar formats for their members. While some formats focus solely on running, others incorporate strength training into this high-intensity interval training (HIIT) format.
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