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The bike that gets you fittest, fastest.
CAROL Bike gives you the shortest, most efficient workout—backed by science. It’s the world’s first home REHIT exercise bike. Delivering the same health and fitness results as a 45-minute run—in just 5.
Short
Get the most efficient 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.
Introducing Reduced Exertion HIIT
Developed by leading scientists, Reduced Exertion HIIT (REHIT) is designed to provide the shortest, most efficient exercise workout. Just 2x20-second sprints create the most powerful training stimulus. With CAROL's AI-personalization making it suitable for any age and fitness level.
Your results, backed by science
CAROL Bike is scientifically researched and proven to improve your fitness and health. Just 3x5-minute REHIT rides a week will improve your cardio fitness by 12% in just 8 weeks.
Optimized for maximum effectiveness and safety
CAROL Bike offers all essential features to make REHIT easy, effective and safe. All components have been meticulously engineered to provide the optimal riding experience.
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 efficient workouts suitable for any age and fitness level - while offering greater versatility and choice than most other smart bikes.
Unlock the key to longevity
Learn how increasing your VO2max can help you live longer, healthier, and better in our free guide for enhancing longevity.
A simple habit, that works
Just 2x20-second sprints, 3x a week. Scientifically-proven to be the most efficient cardio workout—a moment of effort you can always master.
Hear it from our riders
"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."
49.2+9%
Fitness score
"My CAROL Bike has been great to help me achieve greater fitness and power without the time investment but with all the fun!"
36.3+52%
Fitness score
"It's easy to fit a quick 5-minute workout in, especially if you don't need to shower after your workout!"
32.9+9%
Fitness score
"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."
26.6+12%
Fitness score
"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."
32.3+5%
Fitness score
"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."
34.3+12%
Fitness score
"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."
30.3+10%
Fitness score
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 make the most of every workout with CAROL Bike.
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 mainland US, get your new CAROL Bike delivered for free in 7-14 days.
Bike Specifications
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
Technology
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 Play Store:
- 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
Dimensions
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″
Membership
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.
22 Workouts
Choose from 22 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).
Rider Support
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 to your room of choice for $299.
DIY Assembly
With 7-step assembly, and support via phone, chat or email on-hand—setting up CAROL is simple.
Commercial
Looking to use CAROL in your business? Find out more about our commercial offering, here.