Improve your fitness by 12% in just 8 weeks.

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

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

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

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

How CAROL Bike’s short, effective workouts deplete muscle glycogen—and improve aerobic capacity.

CAROL CEO and co-founder, Ulrich Dempfle, unpacks CAROL's science.

Improve and protect heart health through the shortest, most effective workouts.

The shortest, most effective cardio workout just got even shorter.

From maximizing calorie burn to sprint duration—get more from your cardio.

Boost your workout with breathwork

REHIT: The shortest, most effective workout. Backed by science.

Learn how exercise can boost your mental health and well-being with the latest scientific research.

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

Build an efficient and lasting weight management strategy.

The benefits of these low-impact cardio workouts depend on effort.

Understand how to burn fat effectively with cardio exercise.

The intensity and duration you can maintain longest determines results.

Proven methods for increasing VO₂max—the key measure of cardio fitness.

Make your home training more efficient with these home gym machines.

Assemble the perfect setup for your bike and get maximum results from your workouts.

Increase fitness from the comfort of your home with these effective cardio exercises.

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

Discover the scientifically proven health benefits of HIIT bike workouts.

10 home leg workouts scientifically proven to deliver results.

Regular physical activity activates immune mechanisms and decreases risk of illness.

Keep active indoors with the best cardio exercises for achieving results at home.

Groundbreaking research challenges the 'more is better' belief.

Understand the vital role cardio plays in overall fitness.

Enhance your joint range and reap surprising health benefits.

EPOC can help accelerate your post-workout metabolism, making it a powerful tool for managing your weight.

HIIT provides all the benefits of regular training—in half the time.

Discover how regular cardio training can help decrease your resting heart rate.

Enhance skin elasticity to prevent loose skin after weight loss.

Cycling offers gender-specific benefits for women's health and wellbeing.

Cycling activates major muscle groups of the lower and upper body, improving fitness and preventing injuries.

Unlock the power of aerobic and anaerobic energy systems in your training.

Explore the diverse, scientifically-backed workouts offered by CAROL Bike, including REHIT and Fat Burn.

Discover the unique capabilities of CAROL Bike that make it the only choice for REHIT, offering optimal, personalized high-intensity workouts.

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

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