The bike that gets you fittest, fastest.

  • Short

    Workouts from just 5 minutes. Short, effective—easy to fit into your life.

  • Scientific

    The shortest, most effective workouts. Backed by science.

  • Smart

    AI-personalized workouts. With Instant Resistance, for maximum results.

Your perfect workout, backed by science.

Reduced Exertion HIIT (REHIT) and AI-personalization make CAROL Bike unique. Developed with leading exercise researchers to give you the shortest, most effective workout.

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Slow-pedal to prep for your first sprint—triggered by you any time after 20 seconds.
Sprint 1
AI applies the resistance you need instantly, so when you’re pushing hard, the glycogen in your muscles depletes—releasing signalling molecules.
It’s essential to recover well to get the most out of your next sprint—triggered by you any time after 1 minute.
Sprint 2
The signalling molecules released in Sprint 1 switch on, telling your body to get stronger, fitter, faster.
The cooldown brings your blood pressure, heart rate and breathing back to normal.

New Year. Fit you.

Get your free fitness guide featuring science-backed advice for becoming the fittest you—in the least time. No fads. No miracles. Just science.

Download now

Good habits start here.

Order CAROL Bike now, try it for yourself—and build a habit that lasts.

  • 100-Day Trial

    Try CAROL Bike at home for 100 days. And if it’s not for you, return it and get a refund.

  • Fitness Advisors

    All our experts have MScs in Exercise Science—here to help you achieve your fitness goals.

  • Free Delivery

    If you live in the mainland US, get your new CAROL Bike delivered for free in 7-10 days.

  • 0% Financing

    You can buy your CAROL Bike with Affirm. And pay just $216.25 for 12 months at 0% APR.