There has been quite a bit written about this subject lately, there are mounting evidence that training hard have a negative impact on your heart. https://www.

There has been quite a bit written about this subject lately, there are mounting evidence that training hard have a negative impact on your heart. https://www.amazon.com/Haywire-Heart-exercise-protect-heart/dp/1937715671 https://www.amazon.com/Haywire-Heart-exercise-protect-heart/...