What is this lower back/top of butt sharp pain?

Last saturday i was playing football with some other kids and i think i stopped a bit too sudden. i felt a sharp sudden pain in my lower back/ top of butt area and i thought it was nothing. so now it 's been a week and whenever i do anything active: play basketball, run, or even do pushups i get the sharp... show more Last saturday i was playing football with some other kids and i think i stopped a bit too sudden. i felt a sharp sudden pain in my lower back/ top of butt area and i thought it was nothing. so now it 's been a week and whenever i do anything active: play basketball, run, or even do pushups i get the sharp intense pain. do anyone have any suggestions to help me get rid of it?
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