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.

15 Minutes a Week
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