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Co-Founder Q&A: Ulrich Dempfle

CAROL CEO & co-founder, Ulrich Dempfle, answers your burning questions—from the inspiration behind CAROL to the exciting innovation happening in the R&D team.
Ulrich Dempfle built on his background in mechanical engineering to develop the world’s only Reduced Exertion HIIT (REHIT) bike, alongside leading exercise researchers. Ulrich leads on product development at CAROL—from data science to software and hardware.

CAROL’s AI algorithm learns to push you to your limit, so every second matters.

Q: What inspired you to make CAROL?

Ulrich co-founded CAROL to make optimal health and fitness easier to achieve for everyone.


Ulrich was not part of the fitness industry. He worked in healthcare with British health services, where his team designed and ran Chronic Disease Management programs for people with heart conditions and diabetes.


Exercise was one of the most powerful interventions, the only catch is: people don’t do it.


Then in 2012, Ulrich saw a documentary that showcased the most effective and efficient cardio workout: Reduced Exertion HIIT (REHIT). It was love at first sight. The only problem was, you could only do it in a lab.


Since then, CAROL has launched the world’s only REHIT exercise bike for home and gym use.

CAROL’s AI algorithm learns to push you to your limit, so every second matters.

Q: What are you most excited about for CAROL at the moment?

Ulrich is excited about launching CAROL Bike 2.0, designed to maximize training efficiency—with workouts backed by science.


CAROL Bike 2.0 has new rider-inspired features that give you more flexibility, to exercise your own way. Including handlebars with 5 grip positions, so you can mix up how you ride, and a wearable heart rate monitor to track your performance more accurately—and free up your hands while you recover or refuel.

CAROL’s AI algorithm learns to push you to your limit, so every second matters.

Q: Do you have any fitness goals you're working on right now?

Ulrich may use CAROL every day, but studies show it only takes 3 rides a week, for 8 weeks, to improve your cardio fitness by 12%, reduce your risk of type 2 diabetes by 62% – and your blood pressure by 5%.

CAROL’s AI algorithm learns to push you to your limit, so every second matters.

Q: Where are you personally on the CAROL leaderboard?

Thanks to CAROL Bike’s shortest, most effective workouts, Ulrich built a fitness habit that took him from the middle of the leaderboard—to the top 10.


Ready to take Ulrich on? Share and tag us in your leaderboard position on Instagram.

Ulrich Dempfle

CAROL CEO & Co-Founder

Ulrich co-founded CAROL and partnered with the world’s leading exercise researchers to take REHIT out of the lab. 40 prototypes later, the world’s only REHIT exercise bike was launched.

Ulrich Dempfle

CAROL CEO & Co-Founder

Ulrich co-founded CAROL and partnered with the world’s leading exercise researchers to take REHIT out of the lab. 40 prototypes later, the world’s only REHIT exercise bike was launched.

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