What actually happens with your body if you increase cardio?

Question

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?

In: 368

Answer 1

Cardio is about the strength of your heart and your body’s ability to better deliver oxygen and absorb it into its cells. It is what allows your muscle to keep performing in an aerobic state rather than resorting to an anaerobic state.

Anaerobic activity is what makes your muscles sore.