If a heart is a muscle, why doesn’t it ever get tired of beating but things like my arms and legs do? : askscience

https://www.reddit.com/r/askscience/comments/fm2z8x/if_a_heart_is_a_muscle_why_doesnt_it_ever_get/

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First saved: 2020-Mar-21 (Sat)
Last checked: 2020-Mar-21 (Sat), response 200