CAROL Bike: Kris Gethin’s cardio of choice
Coach approved
CAROL Bike: Kris Gethin’s cardio of choice
Kris Gethin, world-renowned body transformation coach and founder of BiohackedAF, champions CAROL Bike as one of the smartest ways to build cardiovascular health and resilience in minutes a day. For Kris, CAROL isn’t just efficient—every workout is backed by science.
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Kris Gethin
on CAROL Bike
“I’ve trained every way imaginable, and CAROL is the most efficient cardio I’ve found — five minutes that genuinely move the needle on my fitness and longevity.”Kris Gethin, Body transformation coach & founder of BiohackedAF
Maximum results. Minimal time.
CAROL’s science-backed workouts make it one of the world’s most effective exercise bikes. Kris Gethin—voted the world’s #1 body transformation coach and a natural pro bodybuilder, IRONMAN triathlete and ultramarathoner—relies on CAROL to protect his heart and energy in minutes a day. As co-founder of the Kris Gethin Gyms franchise, host of The Kris Gethin Podcast and author of the best-selling Body by Design, he’s helped millions train smarter, and CAROL’s efficient, low-impact cardio fits that philosophy perfectly.
Get Fitter
Improve your VO2max by 12% in just 8 weeks.
Live Younger
Improving your VO2max by 12% is like turning your body clock back 10 years.
Save Time
Get all the benefits of a 45-minute run in just 5.
Live Healthier
Reduce your risk of type 2 diabetes by 62% – and your blood pressure by 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.
Warm up
Pedal slowly for up to 2 minutes to prep for your first sprint.
Sprint 1
AI applies Instant Resistance. You push to your limits for 20 seconds, forcing 25-30% mobilization of muscular glycogen, releasing key signaling molecules.
Recover
Pedal slowly and recover for up to 3 minutes.
Sprint 2
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.
Cool down
Light pedalling for 3 minutes, so blood pressure, heart rate, and breathing go back to normal.
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.
- Optimized for REHIT
- AI-personalized to your fitness and goals
- Commercial grade quality frame
- 22+ science-backed workouts
- Integration with third party apps
- And more
Listen to Kris’s podcast with Ulrich Dempfle, CEO and co-founder at CAROL
Kris Gethin talks with CAROL CEO and co-founder, Ulrich Dempfle, about the scientifically proven benefits of CAROL Bike.
“It’s the rapid onset of glycogen depletion that makes the difference. So it’s exactly that slope of the curve that releases the signaling molecules that tells your body it has to get fitter and stronger.” – Ulrich Dempfle, CAROL CEO
Unlock 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.
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.
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.
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.
Developed with leading exercise researchers and scientists, CAROL Bike’s range of scientifically-proven workouts make it the world’s most effective exercise bike.
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.
Order your CAROL Bike today
Experience the shortest, most efficient workouts—
backed by science.
Save £300 with code KRIS.
Save £300Code KRIS
Shop CAROL Bike- 100-day risk-free home trial
- 0% APR financing option
- 5-year frame warranty
- 1x free heart rate chest belt
Join our 35,000+ rider community
Read real reviews from riders who’ve experienced CAROL’s benefits themselves.
"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!"
"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!”
“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.”
“This will help anyone get into the habit of exercising and will also support high performance athletes in reaching higher levels of strength and fitness. I recommend the purchase of CAROL without any hesitation!”
“The transformative impact on how my body feels has made CAROL my undisputed go-to for cardio workouts. As a sports medicine practitioner, I highly recommend it.”
Good habits start
here
Order CAROL Bike now, try it for yourself—and build a habit that lasts.
Save £300
Use code KRIS at checkout to save £300 off your CAROL Bike purchase.
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.
Fast Delivery
If you live on the UK mainland, get your new CAROL Bike delivered to your door.
0% APR Financing
You can buy your CAROL Bike with Klarna. And pay just £199.58 for 12 months at 0% APR.