I recently discovered a short 1 inch 23gauge needle works excellent for the thigh muscles, for months i was using longer needles which actually are for the butt, what happens is that with a long needle, it penetrates the bone and thats how you get extreme stiffness.....basically thrombosis in a mild form, use a 1" 23gauge needle for the thigh, it works like dream. Mind you some injections just fuck out totally, the other day i gave myself a b12+Bcompl injeciton in the ass, fuck it was so sore and when i took the needle out, blood and b12 sprayed like a flipping fire engine all over the room, i dont know what i hit......too bad it wasnt oil, !!!