CAROL is an AI-powered, interactive stationary exercise bike used for reduced exertion high intensity interval training (REHIIT). CAROL’s algorithms instantly create and apply personalized resistance to achieve supramaximal power every workout. HIIT workouts have proven to be much more potent and time-efficient than medium intensity cardio training in improving cardiovascular health.

REHIT was developed by scientists looking for the shortest, most effective and accessible way to exercise. CAROL’s the only bike with REHIT, the next-level HIIT workout that gives you superior health benefits, in 90% less time.

How the REHIT adaptation pathway works

CAROL’s AI-personalization helps you push to your limits during the sprints. Like in a ‘fight or flight’ situation, your muscles are forced to mobilize about 25-30% of muscular glycogen—your emergency energy reserve—releasing key signalling molecules (AMPK and PGC-1a), telling your body it must get fitter and stronger.

You develop more mitochondria, your blood plasma volume increases, and your heart gets stronger. Resulting in increased aerobic and anaerobic capacity.

Dr. Niels Vollaard

“CAROL is the only bike that accurately replicates REHIT outside of the labs. This scientific exercise cannot be done on a regular bike because it requires the supra-maximal resistance tailored to each person’s physiology.”