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Improve your cardio by 12% in just 8 weeks.

1 min read

Improving your VO₂max by 12% is like turning your body clock back 10 years.

1 min read

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

1 min read

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

2 min read

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

2 min read

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

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

3 min read

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

4 min read

CAROL Bike and muscle glycogen: the facts

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

4 min read

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

4 min read

Elliptical vs. stationary bike: which is a better workout?

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

8 min read

Exercise bike vs. treadmill: which one offers a better workout?

The intensity and duration you can maintain longest determines results.

10 min read

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

8 min read