Why does the body need to be trained for cardio? What does your body do when at first u can’t run 1 mile but after a while u can run 10?

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Why does the body need to be trained for cardio? What does your body do when at first u can’t run 1 mile but after a while u can run 10?

In:

Your heart is used to a non effort life so it supplies a small ammount of oxygen to your muscles, blood and eventually brain. When you start exercising, the heart starts pumping more but it’s not used to it yet and can only do it for a small ammount of time. As the effort builds up, your brain gets to “breathe” less and that’s when you start crouching, breathing through your mouth for the necessary oxygen.

(Advanced info: if you keep going tired as you are, you will start losing your vision because of the lack of oxygen)

Our hearts have become used to our inactivity. Our bodies were designed to literally run our prey to death – others were faster but if you couldn’t hide or swim away you were dinner. That isnt the case anymore – you pick up a phone or open a fridge. Think of it like old gears – slow, clunky, seized. Once you start moving, the gears start to work themselves free, your body gets better at lubricating them, and the tolerances become tighter – it no longer takes as much energy to move them.

None of the three answers yet actually address the question, IMHO. I’ll take a stab at it:

Your body’s constantly trying balance a bunch of finite resources. If your heart doesn’t need to pump much blood all the time, the energy to maintain the heart muscle to do that would be better spent somewhere else. Cardio training (and all other muscle training) is just telling the body that it needs to start devoting some of its resources to those muscle groups now.