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15 Minutes a Week

CAROL is more than a bike. With revolutionary design, scientific workouts and an AI algorithm, it's the fastest, most effective way to get fit—in just 15 minutes a week.
Studies prove: 3x Reduced Exertion HIIT (REHIT) sessions a week – just 15 minutes – is the most effective workout ever.

The stages of Reduced Exertion HIIT (REHIT)

REHIT gives you the cardiorespiratory fitness benefits of a 45-minute run—in 90% less time. And that’s just the start. CAROL Bike gives you the shortest, most effective workouts possible—backed by science.

“’Lack of time’ is the most often cited reason for not exercising regularly. The short duration of CAROL workouts cannot be emphasized enough.”

Daniel Green

American Council on Exercise
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