In 2010, the Animal Flow workout program introduced the world to quadrupedal movement training (QMT), a ground-based style of fitness that draws inspiration from animal movements. While QMT, or primal fitness, has spent the better part of the past 15 years stalking the fringes of the fitness industry, the workout has recently roared back in popularity thanks to a renewed interest in calisthenics .

“We're still seeing this body weight-training boom coming out of Covid,” says Tonal coach Kristina Centenari. “A lot of people didn't have access to equipment, and they got to understand the benefits of calisthenics.”

The key to QMT’s appeal—and the billions of views amassed by the #primalmovement hashtag on TikTok—is how accessible it is. It’s an equipment-free (and also just free )

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