Probably for the past month i have been very limited to most activities... Before this, i use to pogo-stick pretty much every day, it's my favorite thing to do. But then one day, while pogo-sticking, i felt a severe jolt of pain in my lower-left back, not on the spine. Ever since this i can hardly run, obviously i can't pogo, jump high, skateboard, and other things like this. My back doesn't just hurt when I'm walking around or sitting down, in fact, it feels fine right now. But when i trigger that spot in my back (i.e. by running fast or jumping high), for the next half-hour or so i can't do much of anything, not even walk normal. This has been EXTREMELY annoying because I want to pogo-stick and skateboard so badly. Has anyone ever heard of this or know what the problem is/how to cure it? P.S. I'm going to the doctor tomorrow to find out what's wrong, I just want a little more insight on what's going... Thanks for your time.