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Biohacker approved

CAROL Bike: Dave Asprey’s cardio of choice

Dave Asprey, the father of biohacking, names CAROL Bike as the ultimate cardiovascular exercise hack in his book Smarter Not Harder. CAROL isn’t just the smartest, most effective exercise bike he’s tried—every workout is backed by science too.

Save $100 with code DAVE.

“This is real. CAROL Bike gives you superior results compared to  traditional exercise—in 90% less time.”

Dave Asprey
Bulletproof and Upgrade Labs founder

Maximum results. Minimal time.

CAROL’s science-backed workouts make it the world's most effective exercise bike. In fact, Dave Asprey is such a believer in the cardio biohacking power of CAROL that he mentions it as his cardio of choice in his book Smarter Not Harder. You'll also find CAROL Bikes at all of Dave Asprey's Upgrade Labs, which are the world's first Human Upgrade Centers.

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.

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.

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 Dave's podcast with Ulrich Dempfle, CEO and co-founder at CAROL

Dave Asprey 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.

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

4.7/5 | 30,000+ riders

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

Save $100 with code DAVE.

Includes:
  • 100-day risk-free home trial
  • Free delivery option
  • 0% APR financing option
  • 5-year frame warranty
  • 1x free heart rate chest belt
$2,595

Everett Myers
3 months

"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."

Everett Myers
3 MONTHS
49.2+9%
Fitness score
Dr Gabriela Moreno
3 months

"My CAROL Bike has been great to help me achieve greater fitness and power without the time investment but with all the fun!"

Dr Gabriela Moreno
1.5 YEARS
36.3+52%
Fitness score
Phil Cox
3 months

"It's easy to fit a quick 5-minute workout in, especially if you don't need to shower after your workout!"

Phil Cox
5 MONTHS
32.9+9%
Fitness score
Ann Meyers
3 months

"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."

Ann Meyers
3 MONTHS
26.6+12%
Fitness score
Peter Bauman
3 months

"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."

Peter Bauman
9 MONTHS
32.3+5%
Fitness score
Germany Mayfield
3 months

"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."

Germany Mayfield
9 MONTHS
34.3+12%
Fitness score
Everett Myers
3 months

"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."

Everett Myers
3 MONTHS
30.3+10%
Fitness score

Join our 30,000+ rider community

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.”

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.”

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

Good habits start
here

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

Save $100

Use code DAVE 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 $207.92 for 12 months at 0% APR.

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