How do our hearts beat 24/7 without needing to take a break/rest period?
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The heart is made of a different muscle configuration. The fibers arre smaller and tighter and far more interconnected than other muscles. This means that minor damage can be repaired and other fibers can simply bear the load and the muscle tears much less easily.
You can still overload a heart of course and obviously this is not recommended, but the key to your question is that heart muscles are simply configured differently and optimized for their role in a somewhat different way that sacrifices raw power for interconneced structures that allow minor damage to be easily repaired..
https://en.wikipedia.org/wiki/Cardiac_muscle
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