Kwik Brain with Jim Kwik 5 Minutes to Longevity & Younger Brain (Science of REHIT) with Ulrich Dempfle
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Sep 1, 2025 
Ulrich Dempfle, CEO and Co-Founder of Carol Bike, discusses the revolutionary REHIT method that allows you to reap the benefits of traditional cardio in just five minutes. He explains how brief, intense workouts can enhance brain health, boost mood, and improve learning capacity. Dempfle highlights the power of neuroplasticity linked to exercise and challenges the time constraints of conventional fitness routines, offering a game-changing perspective on fitness and longevity that can fit into anyone's busy schedule.
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Jim Kwik's Personal Endorsement
- Jim Kwik describes using the Carol bike in his recovery lab and credits it with life-changing benefits for his team.
- He emphasizes he only promotes products he personally uses and found transformative.
Two 20-Second Sprints Change The Game
- REHIT uses two 20-second all-out sprints inside a ~5-minute session to create a powerful training stimulus.
- Short intense bouts release far more BDNF and trigger unique molecular pathways that longer moderate cardio does not.
Big VO2max Gains In Little Time
- REHIT delivers substantial VO2max improvements with minimal weekly time investment, often ~12% in eight weeks.
- Improved cardiorespiratory fitness is one of the strongest, controllable predictors of longevity.