What actually happens with your body if you increase cardio?

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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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Anonymous 0 Comments

I recently went to a learn-to-ride-a-dirtbike course. It was for beginners so nothing extreme, but they teach you to stand as much as possible for better control. Now my legs, forearms, and traps are killing me.

I don’t know if I need more cardio (to at least help the biggest problem: my legs: they’re like noodles the next day) or if it’s basic strength training?

I know this is off-topic. I just am also interested in what cardio primarily improves.

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