Ulrich from Carol Bike Explains the 5-Minute Cardio Protocol That Adds Years | DSH #1807

Digital Social Hour · Feb 4, 2026 · 38m

At A4M Longevity Fest, we sit down with Ulrich Dempfle from Carol Bike to break down the fastest way to improve cardio fitness — without spending hours doing endurance workouts. If you’ve ever said “I don’t have time for cardio,” this is for you. Carol Bike is built around REHIT (Reduced Exertion High-Intensity Interval Training): a science-backed protocol where you only do two all-out 20-second sprints, 2–3x per week, and still see major improvements in VO2 max, metabolic health, and longevity. We also compare Carol Bike vs Peloton, explain why intensity matters, how the bike auto-optimizes…