How is walking barefoot on grass/ soil healthy?

Hi there ! A couple of days ago my best friends and i went to our favorite park and we were just passing by a field of grass and my friends just decided to take their shoes off and just walk barefoot on grass for no reason- i asked why and they said its “healthy” for your feet and soul and to me its abit odd but maybe their right and im being abit paranoid but I don't know, what do you think? Should i?

How is walking barefoot on grass/ soil healthy?
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