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Get Fitter

CAROL Bike increases the maximum amount of oxygen you are able to use during exercise – your VO2max – by 12%.

VO2max is the main measure of fitness. The higher your VO2max, the fitter and healthier you are.


A study by Western Colorado University split participants into 2 groups. Group 1 did 3x short Reduced Exertion HIIT (REHIT) workouts on a CAROL Bike each week; while Group 2 did 5x 30-minutes of moderate-intensity continuous training.


In just 8 weeks, the CAROL Bike group increased their VO2max by 12.3%, the other group by only 6.9%. That’s close to double the improvement—in 90% less time.


Read the full study here.

Listen to CAROL co-founder, Ulrich Dempfle, explain how CAROL Bike gets you fit, fast.

Live Younger

Improving your VO2max by 12% is like turning the clock back on your age by 10 years.

Live Healthier

Reduce your risk of type 2 diabetes by 62%—and blood pressure by 5%.

Next-level HIIT

Why Reduced Exertion HIIT (REHIT) is the most effective workout.

Maximum Metabolism

You’ll burn more calories on a 15-minute CAROL ride, than a 30-minute run.

Time to Thrive

Make the most of your time with CAROL Bike's short and efficient REHIT workouts.

What is a REHIT workout?

Explore REHIT, the game-changing workout that redefines time-efficient training with just 2x20-second sprints.

Demo: How to do REHIT on CAROL Bike

Explore a hands-on guide to doing REHIT on CAROL Bike, showcasing its efficient, effective workouts tailored for every fitness level.

Boost your brainpower

Get fit, stay sharp: how high-intensity exercise and BDNF benefit your brain.

12 benefits of cycling

Regular cycling can help strengthen your heart and lungs, reduce the risk of certain types of cancer, and more.

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