I have a very simple question about exercise?

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I have a treadmill downstairs but do not have shoes to wear when I exercise on them because all the shoes in my house are used for public trips outside and are too dirty to carry downstairs into the carpeted basement. If I use the treadmill without shoes - should I wear socks or go barefeet? What is better? Thanks for your answer. Is there a limit on how many miles I should walk or run each day on the treadmill if I am not wearing shoes when I use the treadmill?
I have a very simple question about exercise?
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