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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. 

Loved by health and fitness influencers

Health influencer Michael Kummer tests out CAROL from a CrossFitter’s perspective

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!) 

Journalist Lara Lewington reviews CAROL in a mini documentary for the BBC

Lara tests out CAROL’s AI capabilities and health benefits for a short BBC documentary. See what she thinks after putting the bike through its paces, and get insights into the science behind our workouts.  

Fitness influencer Sky Life tries CAROL for 30 days in this candid review

Health enthusiast Sky Cowans tests out the CAROL for a full 30 days to get a deeper understanding of how it works. In this video, you’ll see her progress throughout the month, and what she makes of our smart AI that adapts to your performance. 

What our riders say

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

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!


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

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

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.

100-day home trial

Our research shows you’ll get CAROL’s health and fitness gains in 8 weeks. Experience it for yourself, risk-free.

Free delivery in 5-10 days

You’re ready to get started, so we’ll make sure you get the bike as quickly as possible.