For each workout, CAROL will calculate a precise resistance level that is personal ized to you to achieve maximum results.

Produce as much power as you physically can on each ride, and the settings will au tomatically adjust to you over time. Twenty seconds does not sound long, but during that time, you will be working the hardest you possibly can, so it can feel longer!

CAROL also tracks your heart rate and re covery and has built-in safety algorithms that will auto-abort a ride if anything ab normal is detected.

The protocol is suitable for any age, fitness level, and even for those with pre-existing health conditions. Despite the intensity, both the short duration and utilization of a stationary bike to achieve the program’s goals means that the workout will put less strain on the body than other forms of exercise, while also providing many more proven health benefits.

CAROL is an AI-powered exercise bike that provides a personalized training program for each rider. It is based on a high-in tensity training workout protocol known as REHIT - designed in a lab, studied in peer-reviewed scientific research, and refined by CAROL. It provides the fastest health improvements in less than 9 min utes, 3 times per week.

However, CAROL will not feel like a normal exercise program.

Our main protocol is based around just two 20-second sprints and consists of:






2-minute warm-up

20-second sprint

3-minute recovery

20-second sprint

3-minute recovery


Sounds too good to be true?
See it for yourself:

How riders will benefit

CAROL provides many scientifically proven health and fitness benefits, with results in just 8 weeks of 8 minutes and 40 seconds per ride, 3 times per week.

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Cardiorespiratory fitness (CRF) increased by 12%

CRF refers to the efficiency of the body to supply oxygen to your muscles and is in essence is your power per heartbeat. Using CAROL has been shown to increase VO2max in laboratory settings by 12% in 8 weeks, but with our proprietary CRF metric called “Octane Score,” many users will see gains much quicker.

Mitochondria production will reduce your waist size

The CAROL protocols trigger your body to produce more mitochondria, which are the parts of your cells responsible for burning fats and sugars. Having more mitochondria means you will be able to produce more energy, which in turn leads to becoming fitter.

Calorie ‘after-burn’ will reduce your body fat percentage

On CAROL, you will burn calories during your ride, but more importantly, you will also burn more calories after your ride through what is known as “excess post-exercise oxygen consumption” (EPOC). The intensity of the ride will temporarily improve your metabolism, which will also cause you to burn calories after the ride while at rest.

Decreasing your body fat percentage can reduce the risk of developing numerous diseases, including heart dis ease, osteoarthritis, diabetes, and some cancers. There is also a strong correlation between excess abdominal fat and many health risks, including insulin resistance, type-2 diabetes, high blood pressure, heart disease, and high cholesterol.

Health benefits
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Reducing blood pressure by 5%

Exercising with CAROL can lead to a substantial decrease in systolic blood pressure. A healthier heart pumps more blood per heartbeat, needing fewer beats to provide the same amount of blood and oxygen to working muscles. High blood pressure can cause heart disease, chronic kidney disease, and narrow or block the brain’s arteries.

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Reducing triglyceride levels by 10%

Controlling triglycerides in the blood is the key to achieving good health. Elevated triglyceride levels have been associated with an increased risk of heart disease.

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Increasing HDL cholesterol by 6%

High-density lipoprotein (HDL) cholesterol is sometimes called “good” cholesterol because of its inverse correlation to coronary artery disease: the higher your HDL level, the lower your risk of developing this disease.

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Increasing insulin sensitivity by up to 28%

Insulin plays a decisive role in decreasing blood sugar levels. It facilitates the uptake and utilization of glucose by cells, including liver and muscle tissue. CAROL can improve glucose regulation and insulin sensitivity. Research shows that glucose regulation is enhanced with glycogen depletion, which is the foundation of CAROL workouts.

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Improving cardiometabolic health (MetS z-score)

The MetS z-score combines several cardiometabolic risk factor values into a single continuous score.
The CAROL protocols improve cardiometabolic health, cardiorespiratory fitness, and body composition in many ways and is reflected in the MetS z-score. One study found that 75% percent of people saw an improvement in their MetS z- score after eight weeks of training with CAROL, compared to only 47% of people who performed comparable moderate-intensity

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The science behind CAROL

So how does it work, and why are the health benefits so great? CAROL provides a minimum but effective dose of exercise – you get the most benefits for the smallest input, and this is all based on what’s known as “glycogen depletion.”

What is glycogen?

Glycogen is sugar stored in the muscles and is used to fuel further exercise when the body has reached its limits.

What is glycogen depletion?

Our body can store enough glycogen to power up to 15 seconds of additional exercise. After the body uses all of the glycogen, we say it is “depleted.”

Why do we need it?

Glycogen depletion stimulates molecular changes that lead to improved fitness. Humans have evolved this way. The “fight or flight” mechanism is triggered when all-out physical performance is needed, and after exercising to the point of exhaustion, our body starts using glycogen as fuel. Working beyond glycogen depletion will improve your aerobic capaci ty, which in turn will make you leaner, fitter, and healthier.

Why is CAROL the best way to do this?

Workouts performed on CAROL include short “supra-maximal” sprints, meaning that you are working beyond your maximal aerobic capacity for very short durations - this is the quickest, most straightforward way to deplete glycogen and improve your aerobic capacity.

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