Join our 16,000+ rider community

Research shows you’ll get CAROL’s huge health and fitness gains in 8 weeks. Discover the benefits from the scientists, journalists, biohackers, and riders who know best. 

Explore our reviews, press and video testimonials below. 

Read our reviews on Trustpilot

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

Loved by health and fitness influencers

A CrossFitter’s perspective by Michael Kummer

Michael’s a healthy living and tech enthusiast who loves science and doesn’t believe anything unless there’s proof. Check out his in-depth video review of CAROL (and notice his surprise when he doesn’t sweat during a workout!) 

Read full review

CAROL bike review by Coop, Garage Gym Reviews

“I was skeptical, but after using this bike for 2 months, I’m a believer. There isn’t a piece of cardio equipment I look more forward to using than the CAROL Bike.

Coop from Garage Gym Reviews tested CAROL bike for 2 months and here is his review.

Mike Mutzel explains REHIT training

In his video Mike discusses why using power as an objective measurement to guide your  REHIT cardio intensity on the CAROL Bike can improve your fat loss and fitness progress.

What our riders say

Let’s be honest, it’s so easy to blow off a 45-minute workout but a 9-minute workout?? No excuses! Thank you for keeping fitness accessible despite the battles of life. With CAROL on my side, I can keep my fitness goals and regain my health!


ONLY CAROL uses AI that really helps me – I can feel my body get a max intensity workout every single time. And they tell the truth – not breaking a sweat. Add the impeccable product design and engaged, friendly, always useful product support and CAROL’s a top reason to get up and get on every morning!

John Odden

I have lost 41 lbs since starting with CAROL in July of 2020. I am in the best “physical condition” that I’ve been in since my early forties, and I’ve had significant medically demonstrable improvements in my health!”

Larry Gipson

All I can say is nothing matches the return on investment that this bike provides. Everything from the high quality construction, effectiveness , and the variety of training rides have made this the best investment in my long term health and fitness.

David Desroches

Great workout and a very well made bike, I’ve already recommended it to two other people who have also purchased it. I love how it cuts my work out time down significantly. Bravo Carol, Bravo!


Trusted by health and fitness pros

Dave Asprey

“This is real. You’re spending 1/5th the amount of time on CAROL bike and you’re getting twice the results.”

Dave Asprey

Founder, Bulletproof and Upgrade Labs

— Hear why Dave loves CAROL on Bulletproof Radio

Dr. Niels Vollaard, PhD

“In our labs, we see insulin sensitivity improve by 25-28% and fitness by 15% within 6 weeks. The CAROL bike reproduces these results in the real world.”

Dr. Niels Vollaard, PhD

REHIT Researcher, University of Stirling

Martin Gibala, PhD

“Interval training is the closest thing we have to an exercise pill. A tiny bit of sprint training has the same effect on the human body as a whole lot of endurance training.”

Martin Gibala, PhD

Author, the One Minute Workout

— Read about the CAROL bike in the One Minute Workout

Get started with CAROL today

0% financing options available

Pay over 12 months with 0% financing available through Klarna or Affirm financing.
(US and UK only)

Free delivery and 30-day trial

Experience the benefits of CAROL for yourself, risk-free with free delivery.
(US and UK only)

3-month free membership

Benefit from AI-optimized resistance, detailed performance metrics, and new workouts and features with CAROL membership.