CAR.O.L is the AI-powered exercise bike that gives you the cardiovascular benefits of a 45-minute jog in under nine minutes – with only 40 seconds of hard work.

CAR.O.L stands for Cardiovascular Optimisation Logic, which is the software that the bike uses to calibrate the resistance each time you ride. As you get fitter, the bike ramps up the resistance – acting like a sort of automated personal trainer.

Based on the scientifically proven protocol developed by Dr. Niels Vollaard at the University of Bath, CAR.O.L bikes give you the ability to exercise for the shortest possible time with the greatest benefits. This means that each ride is bespoke and totally responsive to you.


SHORT: Workouts from just 5 minutes—easy to fit into your life.

SCIENTIFIC: The shortest, most effective workouts.  Backed by science.

SMART: AI-personalized workouts with Instant Resistance.

It sounds too good to be true, but it is supported by peer-reviewed studies(opens in new tab). CAR.O.L works on the “minimum effective dose” principle of exercise, which the researchers who developed the protocol believe to be two 20-second sprints at a high intensity. This quickly depletes your muscles of glycogen and, in theory, helps your body to become more sensitive to insulin and better at burning fat for energy over time.


CAR.O.L is simple and straightforward to use. During the first six rides, CAR.O.L calculates your baseline fitness and a suitable level of resistance, after which you can start to track your results in the app.

CAR.O.L not only watches your performance, her algorithms respond by automatically pushing you harder in subsequent rides or relaxing your ride if you have had a bad day, and it all happens automatically. You just log in and ride. In short, she ensures that during your sprints, you reach the highest power you can possibly achieve.