im just dancing for fun for some excersice, but when i dance a really fast song, its ok the first time i dance t, but the second time i get cramps, and im like oo nolo, i cant move anymore..... like when u run for too longand u cant take it anymore. i didnt really excersise, and i just copy the dancer of of utube, but what do i do. do i need to warm up or something... and why!!!!??????????????????????
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