For example you could be super in shape from a muscular perspective but have really bad cardio and vice versa.
How is cardio different from physical shape and what exactly happens in your body that makes you have more cardio?
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Apart from what’s already been mentioned, it is theorized that when your heart rate is going during a cardio workout your brain de-prioritizes cognition and instead re-allocates resources to aid movement / metabolism. This can reduce stress / stuck thoughts. This is called the [transient hypofrontality hypothesis](https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6723384/) and is thought to be a contributing factor to “the runner’s high”. It is harder to get this with weights since the high-intensity periods don’t last as long vs. cardio. Transient = temporary, Hypo=less, frontal=frontal cortex of brain (executive planning center). transient hypofrontal = temporary reduction of cognition, like your brain can relax and doesn’t have to think so much for a little while, kinda like meditation.
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