CAROL Bike was developed in collaboration with leading exercise researchers to provide the shortest yet most effective workouts. Our signature REHIT workout delivers the most powerful training stimulus with just two 20-second sprints. Scientifically proven, it offers superior health and fitness benefits compared to traditional cardio exercise—all in 90% less time.

CAROL’s AI-driven personalization pushes you to your maximum during each sprint. Similar to a ‘fight or flight’ response, your muscles mobilize approximately 25-30% of muscular glycogen—your emergency energy reserve—triggering the release of key signaling molecules (AMPK and PGC-1α). This signals your body to become fitter and stronger. As a result, you develop more mitochondria, increase blood plasma volume, and strengthen your heart, leading to enhanced aerobic and anaerobic capacity.