Eli5: why does your heart, a muscle, stiffen over time and become increasingly inefficient while exercise of other muscles throughout the body over time strengthens them, and increases their longevity?

Question

Eli5: why does your heart, a muscle, stiffen over time and become increasingly inefficient while exercise of other muscles throughout the body over time strengthens them, and increases their longevity?

In: 8

Answer 1

Your heart does work like that. If you work out often, especially in world class tournaments, you littarly get a bigger heart. If you then suddenly quit exercizing it can lead to verry sireus issues