Hi, this is my first time being here and I wanted to ask you guys how can I do the uramawashigeri?  Some info about me if it helps -> I am a brown belt in shito ryu karate, and I have been practising for 3 years.  I am 17.  I'm a tiny girl 4'11 ft, 100 pounds.  My senpais say it looks correct when I do it, but when i do it, it hurts the hip.  I've been practising at the dojo last night, and now my left hip area hurts. ARGH! (Ex.  I hook kick with my right leg, and then my left hip area hurts...) I'm a lot flexible than this guy at my dojo, who can do a really fast and strong uramawashi geri (He gets it in several times in competitions) I'm kind of afraid that after a few years down the road, I'm going to need hip surgery or something    Thank you for your help!