Because they are very large muscles and you use them more. When a small muscle is sore you feel it in one specific spot. When a huge muscle like your glutes are sore you feel it all down your leg and half way up your back.
It’s also because you need to use your legs to get around, they can’t be avoided. When your arms are sore they can just kinda lay there. Imagine if you had to do pushups in order to get off the couch and grab a drink from the fridge. Well, your legs are doing squats every time you get up and down.
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