Get your science-backed guide for maximum fitness results—in minimal time. VIEW NOW.

The bike that gets you fittest, fastest.

Short

Get the most effective workout in just 5 minutes with CAROL Bike - short and easy to fit into your life.

Smart

AI-personalized workouts tailored to you – simple to perform and suitable for any age and fitness level.

Scientific

Scientifically proven to deliver superior health and fitness benefits in 90% less time compared to regular cardio.

Your shortest, most effective workout.

Reduced Exertion HIIT (REHIT) and AI-personalization make CAROL Bike unique.​ Just 2x20-second sprints create the most powerful training stimulus.

Your results, backed by science.

Developed in collaboration with leading exercise researchers to create the shortest, most effective workouts.

Get Fitter

1 MIN READ

Live Younger

1 MIN READ

Live Healthier

1 MIN READ

Next-level HIIT

1 MIN READ

Time to thrive

1 MIN READ

Maximum Metabolism

1 MIN READ

More on Science

Hear it from our riders.

Everett Myers
3 months

"I’ve been training for a half marathon and since adding CAROL Bike to my daily routine in the past 2 weeks, my VO2max has gone up 5% already."

Everett Myers
3 MONTHS
49.2+9%
Fitness score
Dr Gabriela Moreno
3 months

"My CAROL Bike has been great to help me achieve greater fitness and power without the time investment but with all the fun!"

Dr Gabriela Moreno
1.5 YEARS
36.3+52%
Fitness score
Phil Cox
3 months

"It's easy to fit a quick 5-minute workout in, especially if you don't need to shower after your workout!"

Phil Cox
5 MONTHS
32.9+9%
Fitness score
Ann Meyers
3 months

"It is a keystone health habit builder that not only makes you feel better but makes you more conscious of acting in healthier ways throughout the day."

Ann Meyers
3 MONTHS
26.6+12%
Fitness score
Peter Bauman
3 months

"Dropping 2.6% bodyfat in ~8 weeks for someone who prioritizes a healthy lifestyle is no easy feat. I’d go so far as to label it as a gamechanger."

Peter Bauman
9 MONTHS
32.3+5%
Fitness score
Germany Mayfield
3 months

"If you’re looking for a quick, effective biohack to improve your cardiovascular health, increase your endurance in an efficient way... this seems to be the move."

Germany Mayfield
9 MONTHS
34.3+12%
Fitness score
Everett Myers
3 months

"CAROL has been a really great way for me to keep active, for me to keep moving without putting too much stress on my body."

Everett Myers
3 MONTHS
30.3+10%
Fitness score

The ultimate CAROL Bike resource

Your 1-stop guide for all things CAROL, presented by our co-founder Ulrich Dempfle. Explore in-depth insights into REHIT workouts, unique CAROL features, habit-building strategies, a selection of tailored workout routines, and much more.

A simple habit, that works.

Just 2x20-second sprints, 3x a week. Scientifically proven to be the most effective cardio workout—a moment of effort you can always master.

A Simple Habit

1 MIN READ

15 Minutes a Week

1 MIN READ

AI-Personalized Ride

1 MIN READ

Your Progress

1 MIN READ

Your Favorite Apps

1 MIN READ

Endless Entertainment

1 MIN READ

More on Habit

Good habits start here.

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

100-Day Trial

Feel the benefits of CAROL Bike for yourself risk-free for 100 days. And if it’s not for you, return it and get a full 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 UK, get your new CAROL Bike delivered for free in 7-10 days.

0% Financing

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

Real riders, real results.

Our riders are at the heart of everything we do. Discover the real impact of CAROL Bike straight from those reaping the benefits every day.

From our community, who know us best.

Hear how our community of scientists, fitness thought-leaders and self-optimizers get the most out of CAROL Bike every day.

Biohacker Approved

1 MIN READ

More on Community

Intelligent design, explained

CAROL Bike is the only bike fully optimized for Reduced Exertion HIIT (REHIT)— making it simple, effective, and safe. It provides the shortest, most effective workouts suitable for any age and fitness level - while offering greater versatility and choice than most other smart bikes. 

Optimal design

3 MIN READ

Grade

Fully commercial-grade exercise bike. Built for professional gyms.

Frame

Heavy-duty, powder-coated steel frame.

Instant Resistance

AI-controlled, motorized resistance applied instantly.

Brake

Silent, friction-free magnetic brake.

Power Measurement

The highest accuracy standard for professional gym equipment.

Handlebar

Ergonomic handlebars with 5 different grip positions.

Saddle

Designed for maximum comfort.

Q-factor

Optimal distance between pedals of 170 mm.

Pedals

Dual-sided toe cage and SPD click pedals, to maximize rider efficiency.

Cranks

Forged steel 170 mm crank arms.

Transmission

Silent poly-V belt with automatic belt tensioner, 1:8 gearing ratio and freewheel safety clutch

Flywheel

Composite flywheel with steel core and brushed aluminum outer ring.

Power Requirements

100 V to 240 V

Screen

11.5” IPS touchscreen with 2K resolution (2000 x 1200)

 

Processor

MediaTek® Helio G99 Octa-Core Processor

 

Graphics

Integrated ARM Mali-G57 MC2 GPU

 

Memory

6 GB RAM

 

Storage

128 GB internal storage

 

Sound

Quad Speakers, Optimized with Dolby Atmos®

 

WLAN

WiFi 6E: 802.11 a/b/g/n/ac/ax

 

Bluetooth

Bluetooth 5.2

 

Ethernet

Wired ethernet via USB-C adaptor (not included)

 

Operating System

Android 13

 

Apps

A wide range of apps available via Google Playstore:​

  • Group classes with Peloton Digital​
  • Virtual rides and races with Zwift, Kinomap, Rouvy, and more​
  • Entertainment with Youtube, Netflix, Disney+ and more​
  • News with CNN, Fox, NBC and more

Footprint

45.5″ x 22″

Bike Weight

120 lb

Rider Requirements

Height: 4’7″ – 6’7″

Max weight: 330 lbs

Space Requirement

45.5″ x 45.5″

CAROL membership gives you and 7 other riders the full CAROL experience.

 

AI-Optimization

Our AI algorithm calculates your optimal resistance, for maximum results—so every second matters.

 

20 Workouts

Choose from 20 scientifically-proven workouts and fitness tests. With more added as the science advances.

 

Multiple Riders

Home membership gives access for up to 8 riders.

Commercial membership tiers start at 24 riders.

 

Metrics

Personalized dashboard with comprehensive performance metrics like Fitness Score; so you can accurately track how your fitness is improving.

 

OTA Updates

CAROL Bike automatically adds new features, functionality and performance with over-the-air software updates.

 

Price

Home membership is £19.99/month (excl. sales tax).

Commercial memberships start from £49/month (excl. sales tax).

Support

Customer support available via phone, chat, or email.

Delivery

If you live in the mainland US, Canada or UK, get your new CAROL delivered for free.

100-Day Home Trial

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

Paid Assembly

Get your CAROL bike delivered fully assembled for $199.

DIY Assembly

With 7-step assembly, and support via phone, chat or email on-hand—setting up CAROL is simple.

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