The bike that gets you fittest, fastest.
Short
Workouts from just 5 minutes. Short, effective—easy to fit into your life.
Scientific
The shortest, most effective workouts. Backed by science.
Smart
AI-personalized workouts. With Instant Resistance, for maximum results.
Your perfect workout, backed by science.
Reduced Exertion HIIT (REHIT) and AI-personalization make CAROL Bike unique. Developed with leading exercise researchers to give you the shortest, most effective workout.
Developed in collaboration with leading exercise researchers to create the shortest, most effective workouts possible.
"I’ve been training for a half marathon and since adding the CAROL to my daily routine the past 2 weeks my VO2max has gone up 5% already."
"My CAROL bike has been great to help me achieve greater fitness and power without the time investment but with all the fun!"
"It's easy to fit a quick 5-minute workout in, especially if you don't need to shower after your workout!"
"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."
"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."
"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."
"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."
New Year. Fit you.
Get your free fitness guide featuring science-backed advice for becoming the fittest you—in the least time. No fads. No miracles. Just science.
From 5 minutes, 3x a week. Scientifically-proven to be the most effective cardio workouts—and so easy to fit into your routine.
Good habits start here.
Order CAROL Bike now, try it for yourself—and build a habit that lasts.
100-Day Trial
Try CAROL Bike at home for 100 days. And if it’s not for you, return it and get a refund.
Fitness Advisors
All our experts have MScs in Exercise Science—here to help you achieve your fitness goals.
Free Delivery
If you live in the mainland US, get your new CAROL Bike delivered for free in 7-10 days.
0% Financing
You can buy your CAROL Bike with Affirm. And pay just $216.25 for 12 months at 0% APR.
Hear how our community of scientists, fitness thought-leaders and self-optimizers get the most out of CAROL Bike every day.