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Copying someone who exercises is not cargo culting. There's a causitive relationship between excercise and health.

Depends, taking up exercise to improve your health isn't necessarily, but believing that you need to take up a specific exercise is a strong indication that your cargo culting.

Whatever works man. So many Americans are obese, I wouldn't diss it.

For example, my friends always said I should try crossfit. I tried it 3 times all with failure. Then I began indoor rock climbing because my friend lost weight doing it. I tried it and loved it. Now I'm 30kg lighter. Took a couple of years, but whatever.

My conclusion: whatever keeps you going.

Healthy and wealthy people find it easier to exercise, too. There’s a dialectical relationship, not a one way cause.

That’s beside the point.

There are mountains of controlled evidence that exercise is extremely good for you.

Yes and we should all exercise.

Also, the effect is overstated because those that find it easiest to exercise need it least.

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