
CAROL Bike is a scientifically-backed exercise bike company that offers the world's first home Reduced Exertion High-Intensity Interval Training (REHIT) bike. Their AI-personalized workouts deliver the same health and fitness benefits as a 45-minute run in just 5 minutes, making exercise highly time-efficient. The bike is designed for all ages and fitness levels, using 2x20-second sprints to create a potent training stimulus that improves cardiorespiratory fitness, metabolic health, and muscle strength. CAROL Bike integrates entertainment and fitness apps, offers a commercial-grade build, and supports multiple riders with membership plans. The company provides a 100-day risk-free trial and 0% APR financing, positioning itself as a leader in efficient, science-driven home fitness solutions.

CAROL Bike is a scientifically-backed exercise bike company that offers the world's first home Reduced Exertion High-Intensity Interval Training (REHIT) bike. Their AI-personalized workouts deliver the same health and fitness benefits as a 45-minute run in just 5 minutes, making exercise highly time-efficient. The bike is designed for all ages and fitness levels, using 2x20-second sprints to create a potent training stimulus that improves cardiorespiratory fitness, metabolic health, and muscle strength. CAROL Bike integrates entertainment and fitness apps, offers a commercial-grade build, and supports multiple riders with membership plans. The company provides a 100-day risk-free trial and 0% APR financing, positioning itself as a leader in efficient, science-driven home fitness solutions.
Product: Commercial-grade smart exercise bike optimized for REHIT (2x20s sprints) with AI-personalized 5-minute workouts
Benefit claim: Delivers similar fitness benefits to a 45-minute run in 5 minutes (science-backed VO2max and metabolic improvements cited)
Founders / leadership: Co-founded by Ratna Singh and Ulrich Dempfle; Ulrich Dempfle described as CEO and co-founder
Funding: One recorded Seed round (listed Jan 1, 2018); total funding publicly obfuscated
Home fitness / connected exercise equipment focused on time-efficient, high-impact workouts
Fitness equipment / Connected fitness
Public profiles list a Seed round on Jan 1, 2018; specific amount and investor names are obfuscated on public pages.