Habit Mar 28, 2023

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.

Black and white CAROL Bike photograph under the lime and violet thermal overlay
Diagram of the REHIT protocol and its five stages

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.

Daniel Green