"A groundbreaking piece of exercise equipment."
The shortest, most efficient workouts
Your workout done in 5- minutes
Developed with leading exercise researchers, CAROL Bike offers the shortest, most effective workouts—backed by science. It’s the world’s first home REHIT exercise bike. Delivering the same results as a 45-minute run—in just 5.
"A groundbreaking piece of exercise equipment."
"After two weeks of riding the CAROL Bike, I ... love it."
"For those short on time, it’s worth the investment."
"If you’re looking to revamp your at-home fitness lineup, CAROL Bike is here."
"It’s a game-changer for busy people."
"Engineered to give you the most effective workout in the shortest time possible."
"A groundbreaking piece of exercise equipment."
"After two weeks of riding the CAROL Bike, I ... love it."
"For those short on time, it’s worth the investment."
"If you’re looking to revamp your at-home fitness lineup, CAROL Bike is here."
"It’s a game-changer for busy people."
"Engineered to give you the most effective workout in the shortest time possible."
Maximum results. Minimal time.
CAROL Bike's short, efficient workouts are scientifically proven to get you superior health and fitness benefits compared to regular exercise—in 90% less time.
Get fitter
Improve your cardio fitness by 12%—in just 8 weeks.
Live healthier
Reduce your risk of type 2 diabetes by 62%—and blood pressure by 5%.
Lose weight
Burn twice as many calories on CAROL Bike than regular exercise.
Save time
Get all the benefits of a 45-minute run in just 5.
The shortest, most efficient workout—backed by science
Developed by leading scientists, Reduced Exertion HIIT (REHIT) is designed to provide the shortest, most efficient 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.
Pedal slowly for up to 2 minutes to prep for your first sprint.
AI applies Instant Resistance. You push to your limits for 20 seconds, forcing 25-30% mobilization of muscular glycogen, releasing key signaling molecules.
Pedal slowly for 3 minutes, clearing lactate and preparing for your second sprint.
Push again to your limits for 20-seconds to activate the signaling molecules released in Sprint 1. This tells your body it must get fitter, stronger.
Light pedalling for 3 minutes, so blood pressure, heart rate, and breathing go back to normal.
What makes CAROL Bike special?
REHIT and AI-personalization make CAROL Bike unique. Just 2x20-second sprints create the most powerful training stimulus. Giving you by far the most efficient intervention to increase your cardio fitness. Learn more from our CEO and co-founder in the video below.
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.
Shop nowUnlock the future of fitness
CAROL Bike's short, AI-personalized programs are designed to get you fitter, faster.
It's the ultimate fitness tool for anyone seeking better results in less time.
The shortest, most efficient workouts
Our signature REHIT workout creates the most potent training stimulus with just 2x20-second sprints. It’s scientifically proven to deliver superior health and fitness benefits compared to regular exercise—in 90% less time.
Personalized to your fitness and goals
CAROL Bike's AI-personalization means it's suitable for any age and any fitness level. Our AI learns to push you to your limit, applying automatic and instant resistance to ensure your workouts are most effective for you.
Significant results in just 8 weeks
CAROL Bike is scientifically proven to improve your cardio fitness by 12%—in just 8 weeks. That's like turning the clock back on your age by 10 years.
22 workouts and counting
Developed with leading exercise researchers and scientists, CAROL Bike’s range of scientifically-proven workouts make it the world’s most effective exercise bike.
Order your CAROL Bike today
4.6/5 | 35,000+ riders
Experience the shortest, most efficient workouts—
backed by science.
Includes:
- 100-day risk-free home trial
- Delivery from £99
- 0% APR financing option
- 5-year frame warranty
- 1x free heart rate chest belt
£2,595
0% APR or as low as £199.58/mo with Klarna. See if you qualify
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.
Michael KummerCAROL rider for 3 years
↗Christy LemireCAROL rider for 1 year
↗Amy StantonCAROL rider for 1 year
↗Join our 35,000+ rider community
Read real reviews from riders who’ve experienced CAROL’s benefits themselves.
Trustpilot
4.6 out of 5 from CAROL riders
Shauna Murphy
"Exercising smarter with CAROL is improving my health week after week. The AI personalization takes any guesswork out of my workouts, so I continue to be challenged and exceed my goals. I am a powerful example of CAROL Bike’s effectiveness!"
Joel Evan
"The most significant barrier for me and my busy clients is TIME, and CAROL removes that; in just 5-10 minutes, you get a cardio workout equivalent to 45 mins. Absolute game-changer!"
Andrea Miller
"CAROL has been a game changer for me. The REHIT Intense ride is revolutionary in the fitness realm. It’s the most effective way to get the fittest, the fastest."
From our community, who know us best
Hear how our community of riders and fitness thought-leaders make the most of every workout with CAROL Bike.
Biohacker Approved
Dave Asprey, the father of biohacking on CAROL Bike: “This is real!”
“I love my CAROL Bike!”
Performance psychologist Dr. Michael Gervais.
From injury to peak performance
“How CAROL Bike helped me regain fitness and reach the top.” - Shauna's success story.
Benefits of a 45-minute run—in just 5
Hear from Human Performance Consultant Ben Greenfield, on the habit of working out.
Good habits start here
Order CAROL Bike now, try it for yourself—and build a habit that lasts.