Why does cardio improve heart health and not worsen it

Question

Hello,
When I do cardio my heart rate climbs twice to about 150-160bpm. People say that it’s actually good for your health and well being of heart. How does making the heart work twice as fast help it instead of hurting it?

In: R7 (Search First)

Answer 1

All these comments are true, but they are ignoring the most important thing: by default, your heart isn’t working at its max capacity, but at a lesser capacity. This means that it can easily work twice as much as it normally does, without straining.