The shortest, most efficient workouts
Developed with leading exercise researchers, CAROL Bike offers the shortest, most efficient 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.
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.
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 and recover for up to 3 minutes.
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.
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.
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.
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.
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.
Read real reviews from riders who’ve experienced CAROL’s benefits themselves.
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.”
Hear how our community of riders and fitness thought-leaders make the most of every workout with CAROL Bike.
Order CAROL Bike now, try it for yourself—and build a habit that lasts.
100-Day Home Trial
Try CAROL Bike at home for 100 days. And if it’s not for you, return it and get a refund.
Free Delivery
If you live in the mainland US, get your new CAROL Bike delivered for free in 7-14 days.
0% Financing
You can buy your CAROL Bike with Affirm. And pay just $216.25 for 12 months at 0% APR.
