how is running good for you?

It's not like a car it's like a person, if you don't use you lose it

There's no limit to how many beats your heart will have before you die. Running makes it beat more during workouts, making it stronger and more efficient through conditioning. Then, in the time between workouts (which is more than 95% of most people's days), your heart will beat LESS then it would if you were out of shape because it is strong and efficient.

The difference in the human body and the car in your analogy is that the body repairs itself and becomes better for it. Repairing a car only restores it to near original form.

I like to think analogy our bodies to a car, with the heart being the engine: Our heart does not have a specific mileage to it, but with exercise it "upgrades" the heart to one that would be stronger and a longer lifespan. If you lead an inactive life, you're stuck with the Yugo engine even if you run it at slower speed, and more likely to fail comparing if you "upgraded" to a Honda or Toyota engine that you run at a higher speed. With any "engines" you can always run the risk of over-revving if you push beyond the limit and suffer a heart attack.

Several people have thought that each person had a limited number of heart beats before they die, so exercise used up those heart beats sooner meaning they die sooner.

That is not true. We do not have a limited number of heart beats built into our system.

Exercise improves and maintains your health and fitness.

Exercise prevents certain disease and illness.

People who exercise and are fit live longer than the average of people who do not exercise.

People who exercise generally have a healthier life style, don't smoke or eat the wrong kinds of foods..

People are not like machines, they continue to repair themselves as long as they are alive.

Your analogy is incorrect. Cardiovascular exercise such as running increases your heart rate but also building the heart muscle so your normal resting heart rate can become lower than normal. This is called hypertrophy. Having a stronger heart muscle will pump more oxygen around the body through the bloodstream.

No because after a few months of running your heart's walls thicken and arteries increase in size so more blood is sent to your lungs with each heartbeat.

Running makes the heart stronger, Runners hearts are so strong that they accomplish in one beat what takes other hearts two beats.

Running is good for you and anyone else because it cleans your blood,frees it from all the cholesterol in your blood by sweating...the more you sweat the cleaner your blood is.Also keeps your heart strong and healthy,that way you dont have a heart attack at age 40...also makes you feel more alive with energy.

Lol!You scared me but I won't run cause I gave up running a long time ago(I still have the speed tough)!

I see what you're saying. But in an analogy (what youre thinking), if a station wagons engine works at a slower speed and a furari's engine works at a must faster speed, the station wagon will get problems less. It's healthier for you to get blood across your body quicker.

You have a very good question cause Jim Fixx who in the 70's advocated running died of a heart attack during a running stint. He was 57 yrs old I believe. Could have been younger, like 54.

Cardio is good for the heart, being stationary you don't work it out. It get's the blood flowing, necessary so you don't have a heart attack, or blood clots.