By Dr. Priyom Bose, Ph.D. Reviewed by Benedette Cuffari, M.Sc. Oct 10 2025 A study challenges the idea that “more exercise is always better,” revealing how elite cyclists may burn through their daily heartbeats faster. This raises new questions about the fine line between fitness and fatigue.  Study: Balancing Exercise Benefits Against Heartbeat Consumption in Elite Cyclists . Image Credit: Duncan Andison / Shutterstock.com In a recent  JACC: Advances study, researchers examined the