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The biggest discount of the year is here. Save $300 with code CYBER300. BUY NOW

Your exclusive IHRSA discount—get $500 off each CAROL Bike. Contact Us.

Get $250 off with code BIOHACKING25. Offer ends 24 June. BUY NOW.

Get $500 off with code EXERCISECOACH. Offer ends 31 May.

Boost your brain, fast

CAROL Bike: Jim Kwik’s workout for a sharper mind

Jim Kwik, leading brain coach and memory expert, loves CAROL Bike's ability to boost brain health, improve performance, and save time. It's the smartest, most efficient way to improve his health and fitness, backed by the cutting-edge science of REHIT.

Save $100 with code KWIK.

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4.6/5 | 35,000+ riders

“If you want to upgrade your fitness and your mental performance in the most intelligent, time-efficient way possible, CAROL Bike is a game (and brain) changer.”

Jim Kwik

Leading brain coach & NYT bestselling author of Limitless.

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 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%.

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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.

Recovery

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.

Cooldown

Light pedalling for 3 minutes, so blood pressure, heart rate, and breathing go back to normal.

See the science

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.

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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
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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.
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 | 30,000+ riders

Experience the shortest, most efficient workouts—
backed by science.

Save $100 with code KWIK.

Includes:
  • 100-day risk-free home trial
  • Free delivery option
  • 0% APR financing option
  • 5-year frame warranty
  • 1x free heart rate chest belt
$2,795

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HSA/FSA
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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 Kummer CAROL rider for 3 years
Christy Lemire CAROL rider for 1 year
Joel Evan CAROL rider for 2 years
Amy Stanton CAROL rider for 1 year

Join our 35,000+ rider community

Read real reviews from riders who’ve experienced CAROL’s benefits themselves.

Trustpilot

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.”

Everett Myers

“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!”

Gabriela Moreno

“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.”

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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

Dave Asprey, the father of biohacking on CAROL Bike: “This is real!”

More on Community
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Good habits start
here

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

Save $100

Use code KWIK at checkout to save $100 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.

Free Delivery

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

0% APR Financing

You can buy your CAROL Bike with Affirm. And pay just $224.58 for 12 months at 0% APR.

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