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People who work out too much often damage their joints to the point where they can't work out anymore when they're older. I like to run, and I have heard a lot of Horror stories from older runners who can't run anymore because they basically destroyed their knees by running like, ten miles a day, six days a week for 30 years.

Some people also say that exercising too much makes you age faster, but I don't know whether or not that's actually true.

So, in my opinion, a person shouldn't work out more than half an hour, 6 days a week, or an hour every other day.

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Q: How many a times a week should an 18 year old girl who weighs 135 work out?
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