CAROL Bike’s Reduced Exertion HIIT (REHIT) workout. Increase VO2max. Live younger.

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.

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

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

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

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

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

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.