Does gynecomastia affect running and stamina?

No, gynecomastia not have any effect on your ability to run and/or your stamina level. Also, after gynecomastia surgery (and the necessary time for complication free healing), you should be able to return to full function, exercise, and stamina. I hope this helped.

In general, after male breast reduction, give yourself at least 6 weeks before hitting the gym hard or running.   If you exercised prior to the surgery, your stamina should return within a short time.Kenneth Hughes, MD, Board Certified Plastic SurgeonLos Angeles, CA

Thank you for sharing your excellent question.  Gynecomastia will not affect your running nor your stamina.  Hope this helps.