Exercise is supposed to be good for the heart – how does forcing a finite organ to work harder not just wear it out faster?

Question

Exercise is supposed to be good for the heart – how does forcing a finite organ to work harder not just wear it out faster?

In: Biology

Answer 1

The heart is a muscle, so it become more efficient when it is strained, just like your biceps.
Work it out, take it for a tumble, it becomes better at what it does.