hi, i'm from arizona, and right now i'm visiting my grandpa in pennsylvania and i ran for awhile while i was living in arizona and it was fine, but now that i'm in pennsylvania it seems so much harder to run. why is this? could it be because of the humidity here and the lack of humidity in arizona? or because it's cold? or what? please answer this, and maybe could you give me some tips on how i can improve my running and endurance. thank you :)
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