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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You know how some cars off the lot have ok gas mileage. Then you can be a kick-ass mechanic that can do things like replace the wheels, lower the weight, improve the aerodynamics, and fix the engine/fuel injector to not only all the car to go faster but also use less gas in the process.
Good cardio is the ability of your body to somehow take in oxygen, get it to parts of the body that needs it, get the energy (carbohydrates and fats) to the parts as well, then remove the waste generated in an efficient way as possible. This can be aided by reducing weight which reduces need for energy to move that weight as well as mobility to aid in efficient movement.
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